Nightfall Series: Myra makes some naive choices and misses an opportunity to kill Prince Vladimir. Franka has no problem calling her out.
The Bartimaeus Trilogy: Deadpan Snarker Bartimaeus does this constantly to Nathaniel; it is practically the basis of their relationship. Sadly, Nathaniel rarely seems to get the point. This is especially ironic because Bartimaeus is a borderline Noble Demon and Nathaniel is ostensibly the Kid with the Leash. It is open to interpretation whether Bartimaeus actually cares, or just gets his kicks seeing Nathaniel squirm.
In Fire and Hemlock, Polly desperately wants a question answered by her friend Tom, which he does not wants to answer. She then forces him to, using magic, ruining everything. He calls her out on it.
Griffin Ranger: Harrell, the Jerk Ass lead protagonist, does the one unforgivable thing for a griffin - he panics and kills an insane hanz (a Servant Race tightly allied with the griffins) that was trying to kill his partner Kwap, and compounds the mistake by killing Ranger Rekken, for whom the hanz was a servant - all because the Big Badhad Rekken's lifemate and chicks. To his credit, he immediately recognized that his shred-first-and-ask-questions-never approach just screwed both of them but good - and will come back to haunt him again and again later on.
Loyal Enemies has a moment that doubles as a 'what the hell'-moment for both participants. Shelena's mocking of Tairinn, Veres' dead girlfriend, finally makes him slap her in front of the entire tavern. Though he's got a good reason considering Shelena's behaviour is just plain distasteful, he goes ahead and slaps a woman in front of everyone despite her having a rather good point in questioning Tairinn's motives. The only thing in her defense is that she's drunk at that time and Veres is emotionally very invested in keeping Tairinn's name clean, seeing as he suffered through torture for it. Shelena is enraged enough to expect Veres to apologize but after thinking it through decides to take the first step.
In Bernard Cornwell's Saxon chronicles, the hero, Uhtred, spends the first couple of books as a violent, arrogant, murderous thug whose only real virtues are loyalty to his oaths and being one of the best fighters around. Halfway through the second book, a prostitute tells him exactly what she thinks of him, and he's forced into something of a personal re-evaluation. He doesn't stop being arrogant, murderous and unfaithful to his wife, but he does start to feel a little guilty about it.
In the Codex Alera series novel Captain's Fury, the First Lord has one of these when he awakens the Great Fury Kalarae prematurely causing the deaths of tens of thousands, to avoid tens of thousands of additional deaths. This provokes a What the Hell, Hero? from Amara and triggering that person's resignation. Of course her real problem seems to be not so much what Gaius has done but his involving her. Maybe she'd have been fine with it if she hadn't had to watch?
Oddly enough, whenever Gaunt does go into a WTH, H moment (drinking, giving up, etc.), it is normally Rawne, one of the most morally grey characters of the series that sets him back on the straght and narrow. Normally by being an utterly Magnificent Bastard.
When Harry is self-wallowing in pity in Order of the Phoenix due to him thinking that he was possessed, Ginny calls him out on his selfishness, reminds him of her encounter with Tom Riddle/Voldemort, and proceeds to tell him that he was not possessed.
Harry mentally applies this trope to his dad in Harry Potter and the Order of the Phoenix. After entering one of Snape's memories, Harry is appalled to see his teenage father casually attack and humiliate Snape for fun in front of a crowd of people (something Harry had experienced himself several times).
In Harry Potter and the Deathly Hallows, we learn that back before Dumbledore was a hero, he was about to to take his mentally ill sister with him, despite the dangers, to go off with Gellert Grindelwald on a mad chase for power and glory when his brother called him on it. The ensuing fight, and its tragic consequences, led Dumbledore to rethink his path and ultimately become the nearly universally admired man he was.
When Lupin decides to abandon his pregnant wife and unborn child (partly from fear and partly in order to protect them from the Fantastic Racism he experiences as a werewolf) and Harry, in a fit of anger, calls him a coward, says he's ashamed, and informs him that it's not what James would have wanted. Lupin, usually quite reasonable, comes to realize the error of his ways after a brief fit.
McGonagall to Harry, after he uses the Cruciatus curse, though that is more calling him out for being in a building where everybody wants him dead.
Snape gives one to Dumbledore, when Dumbledore reveals that Harry, whom Snape has been protecting out of his love for Harry's mother, must die in order to defeat Voldemort. It wasn't that simple but Snape didn't know.
Dumbledore gives one of his own to Snape when he realizes that Snape is only worried about Lily being spared in Voldemort's attack and doesn't care if James and baby Harry are killed. Granted, he and James hated each other, but the murder of an innocent baby doesn't seem to bug him as long as he gets a chance to comfort the widow.
Ward of Hurog is given one of those on several occasions, but among the most impressive moments is when he calls Oreg to him (using magic) after they have been separated for a time, and Oreg slowly materializes, clings to his legs and begs him not to leave again. The person who witnesses this wants to know what the hell Ward did to Oreg. It is nothing that Ward did, though - it is just that Oreg is magically bound to him by magic that's far older than Ward himself, and doesn't react well to being separated from him due to this.
Foxleap's plan to save a group of a cats from a hawk goes wrong and one Tribe cat gets killed. One Tribe cat scolds him harshly for not listening when he was told to not interfere.
Also, Echosong did not approve of Leafstar driving Billystorm out of the gorge and had to spell it out for her.
In The Sun Trail, Clear Sky calls out Gray Wing for killing Fox...though HE was the one to tell Fox to attack him. Later, Gray Wing calls Clear Sky out for banishing Jagged Peak from the community and refusing to take in his son Thunder.
Pretty much every main character in Animorphs has had several of these. The one calling them out on it — mostly in a sober, thoughtful fashion — is usually one of their own, commonly Cassie.
Jake defeats the Yeerks with a truly magnificent What the Hell, Hero? sequence. Erek the android calls him on it before he even starts, but he does it anyway. One of the major steps in the sequence is when he flushes the Yeerk pool in the orbital spaceship into space, killing tens of thousands of Yeerks in one shot. After the war is over, he gets accused of war crimes during a trial. In addition, recruiting the auxiliary Animorphs in the first place, all of whom are handicapped children because the Animorphs knew the Yeerks wouldn't bother to infest them, got a What the Hell, Hero? out of Cassie's dad.
A slightly less serious example, but still in and of itself a What the Hell, Hero? moment is when Tobias is at a dance with Rachel, in his human morph, and she tries to trap him in it so they can have a normal relationship. Tobias doesn't exactly call her out on it, because part of him isn't entirely convinced she wasn't right.
Eragon then delivered his own What the Hell, Hero? to Sloan, calling him out for betraying his entire village to inhuman monsters whose primary diet consisted of humans as well as trusting them to keep their word when they kidnapped his "beloved daughter", who he ALSO sold out to them out of a petty grudge toward Eragon's cousin (who wished to marry her and wound up getting mauled by those abominations) as well as irrational superstition. He also murdered a night watchmen in order to rat out his village to the Ra'zac.
Later, Elva calls out Eragon for his actions (namely, trying to cast a spell to more completely undo the enchantment he'd placed on her, after she said she preferred to leave it as it was) by comparing him to Galbatorix. This seems to have more of an effect on him.
As with many, many things in the Inheritance Cycle, this is highly subjective. Especially the situation with Sloan. But one What the Hell, Hero? cannot be denied, and that is the nameless soldier in Feinster who calls out Eragon for helping to perpetuate a brutal war when the majority of the empire just wants to go about their lives.
Perhaps the best WTTH? in Inheritance is the poor soldier Eragon and Arya meet on their way back to the Varden. "Why are you doing this, you're a monster!" he screams as he surrenders. Eragon still murders him because "he was a threat."
In Nineteen Eighty-Four, Winston Smith joins what he thinks is the resistance movement against "Big Brother." The supposed leader of the resistance, O'Brien, questions him on what he's willing to do for the movement. Smith agrees to everything O'Brien asks, including rape, murder, arson, terrorism, and even throwing sulfuric acid into an innocent child's face. Later on when it is revealed that O'Brien is a double agent working for Big Brother, he plays a tape of Smith confessing to this in order to destroy Smith's claims of moral superiority.
In The Malloreon, Garion gets a tongue-lashing from Belgarath after the thunderstorm he creates to stop the Mimbrate civil war ends up disrupting weather patterns across the continent, and is told that magic shouldn't be used so recklessly.
The Elenium features a scene where Sparhawk wants to go kill Krager before he can cause more trouble, and it given this reaction from Aphrael, pointing out that if Sparhawk goes to do this, then Ehlana is left vulnerable to attack.
Parodied in the Discworld novel Hogfather by Susan: "... and then Jack chopped down the beanstalk, adding murder and ecological vandalism to the theft, enticement and trespass charges already mentioned, but he got away with it and lived happily ever after without so much as a guilty twinge about what he had done. Which proves that you can be excused just about anything if you're a hero, because no one asks inconvenient questions."
In Jeff Long's The Descent, the bad guys (or one set of bad guys at any rate) are seeding the underworld with a deadly biological weapon to kill everything and later colonize it. Then at the novel's ending, the main character, who had been living with the degenerate troglodytes/demons for years, uses the dead Dragon's bioweapon trigger, effectively genociding most of them. Also doubles as Nice Job Breaking it Hero because the big bad (YMMV. The demon king, at any rate) survives, and is likely not happy about it.
The Star Wars Expanded Universe work Before the Storm had Luke being called out on boasting about destroying the Death Star, the accuser pointing out the deaths of the million people onboard. Of course, Luke points out that the Death Star was a planet-killing superweapon.
In Wraith Squadron, the Wraiths pull a prank that gets a cantina full of people to think that one of their female pilots is married to their Gammorrean pilot. Falynn is highly offended and doesn't find this funny, but then Piggy stops her, asks if she'd react like this if the prank had involved, say, Kell instead of him, and she immediately realizes that she's being speciesist, realizes that it is funny and apologizes, and they play along with what the cantina thinks, Holding Hands like young marrieds.
Karen Traviss's Republic Commando Series provide a chance for various characters to call this on the Jedi, the ostensible good guys of the Star Wars universe, for taking a conveniently provided army of 'living slaves' who have been 'torturously abused' since birth and using them as 'cannon fodder' for a war in which the soldiers have no stake.
In Jedi Apprentice, young Obi-Wan decides to leave the Jedi in a To Be Lawful or Good situation, then regrets it because of the tragedy that ensues. The calling-out is twofold:
When Obi-Wan decides to come back, everyone in the Jedi lets him have it for being impulsive, disobeying orders, causing all Masters to question the loyalty of their own Padawans, and leaving Qui-Gon in particular when he already had one apprentice leave him (and become the Arc Villain, no less). This goes on for two and a half books until Qui-Gon finally accepts him back.
Yoda and Tahl admonish Qui-Gon for essentially giving Obi-Wan a Sadistic Choice to either abandon his friends, who had helped them when trying to rescue Tahl in the first place and were trying to end a generations-long bloodbath, or leave the Jedi entirely.
Lucas Trask in Space Viking by H. Beam Piper has an internal one when he's talking with an eight-year-old princess and wonders how many of the people killed in his raids earlier in the book had been children.
The Army Suicide Prevention Interactive DVD has a moment like this - video clips show two soldiers and their families talking and the viewer chooses from options on what one soldier should do to help the other. Near the end, a choice comes up - "Physically restrain your friend and take him to a psychiatrist." Selecting this causes the Omniscient Narrator to say "Whoa! Really? Think about that for a second..." Followed by the main character placing his friend in a headlock and dragging him out of a mess hall while other soldiers look on, stunned.
In the third book of The Wheel of Time, Mat infiltrates the best-defended fortress in the world by himself to save the three Action Girls. They basically kick dirt in his face as thanks. Several books later, a few other female characters call two of them on it and force them to apologize.
In the twelfth book, Rand balefires an entire friggin' castle in order to kill ONE (count 'em, ONE) of his enemies. And we never even see her body, so there's no proof it actually worked. It was at about this point other characters began to take a lot more notice of just how goddamn insane he'd gotten. Later in the same book he almost rains lightning down on an army of potential allies simply because they got highhanded (in such a way which invoked his irrational fear of being confined which had been caused a few books earlier) but manages to be talked down with another comment invoking this trope. Given Rand had access to destroy the world and was by this point overcome with paranoia, rage and schizophrenia, it is little wonder people waited until he was at the very limit before they really started calling him on such tendencies (which had been building for many books as his breakdown and psychosis developed).
At the end of The Ethos Effect by LE Modesitt Jr, the hero is forced to decide whether it is permissible to kill many people now so that more can live peacefully in the future. He decides that it is, and decides to commit genocide on the new would-be Evil Empire, before it can become a threat to the rest of the galaxy. Some extremely pacifistic Sufficiently Advanced Aliens call him out on this, accusing him of misusing their technology. He argues with them, saying that no, he's not a deity, just a tool-using creature who used the biggest hammer he could find because nothing else could possibly do the job, complaining that they're too afraid of corrupting themselves to take sides when humans fight each other.
In Emma by Jane Austen, Emma gets rebuked by Mr. Knightley because of her cruel behaviour to Miss Bates.
Patroclos, in the The Iliad, calls Achilles for moping over Briseis instead of fighting for Greece.
In Book 3 of the Aeneid, Aeneas and his men stop on an island and prepare for a meal, when a bunch of harpies come down and ruin the food (because that's what harpies do). So they prepare again, this time concealing weapons: when the harpies return, they attack. But not only are the harpies invulnerable (so the meal is still ruined), once they've flown to safety, one of them, Celaeno, gives a What the Hell, Hero speech, pointing out that the harpies were there first, and it's a little disproportionate to start a battle over some ruined food.
One of the Doctor Who Expanded Universe short-story collections had a tale with an AI that could recharge itself off emotions, attempting to get enough power to send a message and prevent the destruction of the planet it was on. In the end, it decided that the best solution was to call the Doctor out on some of his less pleasant actions - such as abandoning his daughter on a relatively barbaric world and inciting a race to war to find his lost pen.
A Song of Ice and Fire probably contains a couple, but first to mind is Sandor Clegane's deeply satisfying rebuttal to the accusations that the seemingly-oh-so-noble Brotherhood Without Banners lays against him. "I'm the same as you. The only difference is, I don't lie about what I am. So kill me, but don't call me a murderer while you stand there telling each other that your shit don't stink. You hear me?"
An earlier one is when Varys tells the imprisoned Ned Stark that his Honor Before Reason has caused a lot of damage that would have been avoided if he had simply chosen one of the several less honourable options he had been presented with.
Arianne and Doran Martell give this to each other after the former has nearly gotten an innocent girl killed and started a war in a scheme to claim her birthright, which she only started because the latter's apparent passivity and secretive nature gave her good reason to think she had to force the people of Dorne into action. The result of this reciprocal What-The-Hell-Hero-ing is that they mutually acknowledge their own faults, heal the breakdown of communications, and reconcile enough to work together.
The Acts of Caine are rife with this in all directions, given how nastily the Actors sent by the Studio act one they're on Overworld, and how much of a Jerkass Caine is. Notable ones in Blade of Tyshalle include the message sent by the dying primal regarding the HRVP infection, sections of Raithe's slow Breaking Speech to a captured Caine, and Caine and Kierendal ripping each other verbally after the HRVP outbreak in Ankhana. That last example is an interesting two-way example of this trope (Caine is the obvious protagonist, and Kierendal suspects she may be saving the Folk and the city from a Sociopathic Hero).
In A Series of Unfortunate Events, when the orphans are forced to burn down a hotel to survive, they wonder if they are really the "good guys" after all. To elaborate they have been framed for murder again and Olaf threatens to poison every person in the building. Sunny suggests the burning and reluctantly Violet and Klaus comply wondering what Sunny's plan was, since they had to worry both about getting out of this sticky situation alive and about saving all those people from the Medusoid Mycelium. They do it mostly to themselves but Justice Strauss also phrases it, even though she comes across as very naive. They then use the elevator to warn as many people as possible and Sunny reveals that she did this as a way to warn that it was no longer safe there.
In The Wide Window, the orphans briefly give Aunt Josephine one when she offers to let Olaf have them if he wants, so long as he lets her live.
In a Crowning Moment of Awesome, at the end of The Vile Village, Hector finally overcomes his fear of stuffed crow hats to call out the village elders for their horrible treatment of the orphans, pointing out that the children have had nothing but poor treatment since their parents died, that the village was called upon to take care of them, and instead they just used the children as cheap labor. Of course, the village elders are only "heroes" in the sense that they aren't affiliated with Olaf...
There's a moment at the end of Fool Moon, second novel, where he has to confront a pack of hexenwolves, or werewolves who use enchanted belts to change form. At this point, he's physically and magically exhausted. Having defeated one earlier and stolen his belt, he uses it, and becomes a raging monster. His wake-up call moment comes when he sees his reporter girlfriend, and she's terrified of him.
In White Night, Murph calls out Harry when he lets his temper get the better of him and he flings a fireball at a building. As Murph points out, Dresdenverse magic can only be done when you truly believe in what you're doing. This fact is the wake-up call Harry needed to realize Lasciel's shadow was influencing him.
In New Mexico, Ramírez tried the same. All he achieved was Harry's mercy, by execution, for the ghoul he'd been torturing. Harry himself remained cold and angry and terrifying.
It's averted in Changes, when Harry agrees to become Queen Mab's Winter Knight. Everyone understands why he did what he did, and offer their moral support. Then it goes double for substantial chunk of the next book, Ghost Story, features Harry mentally applying a What the Hell, Hero? to himself for the lines he crossed in Changes. The other characters don't really get to do it until Cold Days.
Harry gives a few of these to Molly over the course of the series when she does something reckless, often when she's tried to once again Mind Rape someone despite being absolutely forbidden to do so (for extremely good reason) under pain of both her and Harry's deaths.
In Chekov's story in the Star Trek: The Original Series book Kobayashi Maru, he gets called out for his actions during a training exercise where the cadets are told the scenario is one where one of them was a traitor. Chekov's solution, which is what he imagines his hero, Captain Kirk, would do? Stun all the other cadets, including the ones who had allied with him, to make sure he wouldn't be taken out by the traitor. No cadet actually had been designated as a traitor; the exercise was to see how they dealt with a situation that could cause paranoia. (Kirk's solution had been to get everyone to cooperate.)
Mackenzie Calhoun from the Star Trek: New Frontier series got a doozy of speech from his first officer when he ran the Kobayashi Maru test when she disagreed with his solution: destory the Maru, on the basis that if the ship was a trap, the explosion would damage the Klingon ship and, it is was a genuine distress call, he would be saving the crew from torture and execution at the hands of the Klingons while buying his ship time to escape. Amusingly enough, the first officer also got a speech for failing to obey his orders during the test.
In Victory of Eagles, Captain Laurence is sent to take a group of dragons and interfere with French foragers, thus disrupting Napoleon's supply lines, and is told to "give no quarter", meaning that if any Frenchmen try to surrender...too bad. Eventually another character shows up and says, "Laurence, what are you doing?" Unusually optimistically for this trope, this is, in fact, enough to get Laurence to stop.
Joseph Rosenberger's ultra-violent COBRA novel series often has its "heroes" - a group of secret operatives - crossing the Moral Event Horizon for the sake of a mission. In one of the books a colleague challenges the team leader, Jon Skul, when Skul indicates that he needs to kill a police car full of cops in order to prevent them from interfering in a mission. Skul replies with a "put up or shut up" statement and proceeds to follow through with his plans.
In Death series: Eve got this from Peabody in Ceremony In Death and Witness In Death. It made Eve feel bad. Eve, on her part, got to pull some epic ones with Don Webster in Judgment In Death and Karen Stowe in Betrayal In Death.
Sisterhood Series by Fern Michaels: The book Payback had Jack giving Nikki this after suffering a No-Holds-Barred Beatdown from three men with gold shields sent by Charles. Shortly afterwards, Nikki gives one to Charles. In Sweet Revenge, Jack gives this to Nikki over the Vigilantes trying to get revenge on Rosemary Hershey by driving her literally insane!
The prominence of Black and Gray Morality in The Chronicles of Magravandias means that What the Hell, Hero? is almost the status quo of the series. The heroes of the story, such as they are, constantly disagree, do questionable to deplorable things, and argue with each other over who is less wrong.
Skulduggery Pleasant: Valkyrie gets this from Fletcher on a number of things in Death Bringer. It even makes her pause and consider her actions. For a moment.
No one is really happy with anything John does in Dirge for Prester John, and he is often called out for his prejudice. Even Hiob, several centuries later, judges John for falling away from Christian teaching.
Edilio Escobar is possibly better than anyone else at making Sam realize the implications of some of his actions, or inaction, as the case may be.
Qwill gives himself one at the end of The Cat Who Played Post Office. While his girlfriend Melinda is praising him for learning the truth about what happened to a missing servant girl, Qwill points out that by digging into the girl's disappearance, he caused those responsible for what happened to the girl to panic and kill three other women; if he'd stayed out of it, the killers would never have been brought to justice, but those women would still be alive.
In Star Trek: Articles of the Federation, President Bacco gives two of these speeches. The first is when she condemns the Federation Council for considering renewing trade agreements with Aligar, a culture whose exports are prepared by slave labourers - she later apologises for her behaviour. The second time, she points out the disturbing implications in the actions of Admiral Ross after the truth about his role in deposing President Zife comes to light. She notes that not only did he take it upon himself to remove the President from power, but in his public support for Bacco he also used his influence to encourage the ascension of a leader he personally preferred.
In Captain Vorpatril's Alliance, Simon Illyan, who is implicitly trusted by the Emperor, especially in matters of national security, conspires to help a group of foreigners steal priceless historical treasures, starting a course of events which results in the sinking of Imperial Security's headquarters. On finding out about this, more than one person's response is "What the hell, Simon?"
Cathy and Chris are constantly demanding this of each other in Flowers in the Attic. Cathy because Chris is so easily duped by their mother, who is keeping them locked up. And Chris because Cathy is extremely critical of their mother, who is the only person they can rely on to take care of them.
In The Wishing Spell, Carter calls the Fairy Council out on how they were punishing a fairy who lost her temper and turned the wings of another fairy who was teasing her into prune leaves for a few seconds (and how they were ready to banish her), but they werenít doing anything about the Trolls and Goblins enslaving people. Though they donít show their shame, they all admit that heís right, and the fairy is pardoned.
At one point in The Scorch Trials, Teresa psychologically and physically tortures Thomas to a severe extent, because WICKED had requested her to do so, and she believed it was for the best. When Thomas recovers from the ordeal, he is understandably angry at Teresa, especially since she didn't try to find another way to go about things, as Thomas and his friends had on many occasions. Teresa believes she has nothing to apologize for, due to being ordered to make the hard choice between letting WICKED murder him, or hurting him emotionally herself. She gets annoyed at Thomas because he resents the way she treated him. Teresa acts like nothing happened and tries to continue their budding young romance, even kissing Thomas to shut him up. Thomas calls her out on her behavior and is completely turned off to her for the rest of the series.
The Epic of Gilgamesh has one near the end, though it's more about arrogance than vile deeds. Having finally reached the ends of the earth, Gilgamesh asks the immortal man Utnapishtim how to never die. Utanpishtim gives a long and terrifying account of how he saved every living thing from a flood sent by an angry god by gathering them all in an arknote the first recorded instance of the Deluge myth, which you may know better as Noah's Ark and enduring the subsequent terrors. For this, the other gods rewarded him and his wife with immortality. Then he says, paraphrased, "so what did you do to earn eternal life lately?"
Lucy from The Sex Lives Of Siamese Twins saves two homeless men from being killed by a deranged gunman and is hailed as an instant hero by the media. This quickly changes once it's revealed that she, in reality, saved two serial pedophiles from a broken victim of child sexual abuse.
Subverted when Al commits suicide following Tris'sRejected Apology. Four doesn't call Tris out for that, since her anger is reasonable given the circumstances, though he does ask if her anger at Al is useful after his death but for sticking out like a sore thumb and risking trouble.
Tris's dad calls her out for shooting Peter in the arm. Though she points out that, despite being Dauntless, he is cowardly and borderline psychopathic and lives depended on it. She knows he will give in quickly once he is in pain.
In Insurgent, Tobias calls out Tris multiple times of being suicidal. In return, Tris calls out Tobias for being a hypocrite. He tells her that she's strong enough to take her scolding, but still tries to "protect" her. He insists she be open and honest with him, while still insisting on the right to keep his own secrets. He says he trusts her perceptiveness, but refuses to listen to her warnings about people repeatedly. Thankfully, the both of them get better. Eventually.
In Star Trek: Destiny, Geordi La Forge gives Captain Picard this when he decides that the best way to beat the Borg is to use thalaron weaponry, a weapon so deadly people died to stop it from being used. Geordi specifically points out that he wasn't going to sully Data's memory to use a weapon he gave his life for to prevent being used - when he goes to object to Picard, he's not doing the 'I want it on the record that I protest this action' spiel we'd seen done many times, he outright refuses to do it, telling Picard that he can relieve him of duty and court-martial him for it, but he will under absolutely no circumstances develop or utilize ANY thalaron weapons.
In one of the Left Behind novels, a minor character who has been pretending to be a Christian but has secretly been lining his pockets at their expense and may be planning to betray them is tricked and cheated by the main characters, who are congratulating themselves about it when another minor character asks them almost literally the trope question. His point is that they've almost certainly doomed the guy to everlasting hellfire because he might eventually have repented and become a Christian for real, but after being cheated by them there's no way he will ever do so now. Given the general tone of the books (where "Christian" and "Good" are treated as essentially synonymous), this is rather surprising (and a bit of a Take That! to the reader, who was probably rejoicing along with the protagonists at their "victory").
A handful of times in the Rizzoli & Isles series, Jane Rizzoli gets called out on her Irrational Hatred of beautiful women (which is out of jealousy that she herself is average looking). In particular, her first partner Thomas Moore adds a dash of Brutal Honesty to this when he suggests that what really turns men off isn't her plain looks, but her brusque and abrasive personality.
"What guy is going to like you when even YOU don't like yourself?"
The Hunger Games: Katniss imposes this on herself a few times, most notably in Mockingjay when, after killing the unarmed woman, Katniss notes how she's graduated to killing unarmed civilians, and also notes in passing that she's become so accustomed to killing that she forgot all about taking the woman's life.
City of Light: Rahze's companions react this way when he kills a defenseless man in cold blood for striking him.
In Mana Mutation Menace, Kasile gives Nolien a royal dressing down for knowingly setting off Dnnac Ledo's anti-ordercraft alarms, thus endangering the Medical Mana Mutation negotiations and potentially starting a war.
In Transcending Limitations, Eric is enraged by the Ordercrafter Hunters kidnapping human infants in Sueno. They see themselves as The Kindnappers and he sees someone separating a child from their parents.
In Transcending Limitations, Annala is struck and berated by Meza and then scolded by Sagart for launching depopulation arrows at ten towns as a Mercy Kill for the hopelessly mentally dominated people living there. Once she comes to her senses, she has a My God, What Have I Done?. Fortunately, her future self steps in and saves the towns.
In the Dreamblood Duology, Sunandi at one point asks how Ehiru and Nijiri can effectively live as hitmen. They in turn ask her how she can lie for a living.
In Below, Brenish goes off on Tibs for murdering Dex by letting an approaching danger sneak up on him. Tibs isn't having it, claims full justification, and throws it right back in Brenish's face—for which Brenish later chastises himself for beginning to think too much like their boss. Beware the Nice Ones, indeed.