When people think of good guys and bad guys, most would expect that they should trust the heroes over the villains. After all, if the heroes want to succeed in their mission, they need allies that can trust them, which is difficult if they don't tell the truth, right?
Just as outside appearances, dress quality, and social interactions can run contrary to expectations in a good and evil dynamic, so too can actions compared to words. In this area of contrast, the hero is spreading lies and the villain is truthful.
There are a number of ways this trope can appear. One could be that the hero's plan relies on trickery and/or secrets while the villain has no need to hide their true intentions due to the power they wield. The heroes could have secrets that they want hidden from their allies and the villain is trying to expose those secrets. Or the lies told by the heroes are intended to lure the villain into a trap set up by what was learned from the villains.
While this can go hand in hand with Polite Villains, Rude Heroes, both can exist without the other being in play; nice heroes can be dishonest, and mean villains can be truthful. This can be seen in Chevalier vs. Rogue settings where The Hero is the Rogue and the Big Bad is the Chevalier. The trope can also be related to From a Certain Point of View or Double Speak, where the villain tells the truth, but in a manipulative or convenient way.
Done well, the trope can illustrate how heroism can spell dilemmic circumstances for those seeking to do good; done poorly, it can make for a case of the villains becoming more sympathetic than the heroes.
Subtrope of Good and Evil for Your Convenience. This trope can readily appear in situations where Villains Never Lie. Often a sub trope for Pragmatic Hero if the hero in question believes they must be deceitful or underhanded to achieve a greater good. Can overlap with Go Mad from the Revelation, where the "truth" is so awful that the heroes may have a justified reason for keeping it secret.
- In JoJo's Bizarre Adventure: Battle Tendency, Joseph Joestar is a known trickster who tends to manipulate his foes' behavior with lies to catch them off guard. By comparison, Wamuu is a proud warrior and a Fair-Play Villain who sees Joseph as a Worthy Opponent.
- In One Piece, Usopp makes heavy use of lies, deception, and misdirection as part of his battling style. The bad guys he fights, on the other hand, tend to rely solely on their powers or brute strength, confident that they can beat Usopp without having to do anything complicated.note
- The Empire Strikes Back: Darth Vader reveals that he is Luke Skywalker's father when Obi-Wan Kenobi and Yoda intentionally misled Luke into believing otherwise.
- Romancing the Stone: When Ralph steals the stone from Joan and Jack (who was previously plotting to keep it for himself), he points out that at least he's being honest about stealing it, not trying to seduce Joan for it like Jack was.
- Supernatural: In "The Man Who Knew Too Much", Castiel (an angel) and Crowley (a demon) team up to open a gate to Purgatory and absorb all the souls within for power. Shortly before the ritual can be performed, Castiel cuts Crowley out of the deal. Crowley is shocked and enraged that he was the one who had been acting in good-faith and got betrayed.
- Immoral Journalist Freddie Lounds tells Abigail Hobbs the truth that she is under suspicion of the murders her father committed, and that she has to get her story out there. Will is in total denial about just how much Abigail is suspected of from the police and tries to stop her talking to Freddie.
- Hannibal is a total Manipulative Bastard (and his reasons for telling the truth are equally manipulative), but he tells Will the truth: that Margot manipulated him into having sex so she could claim a legitimate heir to her family's fortune, a fact which she conveniently kept from him.
- In the eternal Enemy Mine relationship between The Doctor and The Master in Doctor Who, this trope is applied to the Twelfth Doctor and Missy (a.k.a. The Master in female form), where the former is a Byronic Hero who can't trust even in his companions and hides secrets from them, and the latter is a Lovable Alpha Bitch who always says the truth to him and Clara Oswald.
- Star Wars Legends:
- Played With in Star Wars: The Old Republic; in the Bounty Hunter story-line, the Hero Antagonist Jun Seros is a Jedi who uses deception and trickery to hunt you down for revenge for killing his friend, while Darth Tormen is your main benefactor for a portion of the story and is a completely honest Blood Knight.
- Knights of the Old Republic: The Player Character and their non-Jedi party members are consistently lied to in regards to The Player Character's actual identity by the Dantooine Council and Bastila, a fact that party member Carth will frequently complain about. Unfortunately for everyone, Darth Malak and Admiral Karath are telling the truth...
- Knights of the Old Republic II: The Sith Lords takes this trope, along with everything else in the setting, for a ride in the Deconstructor Fleet. You do get a lot of the backstory from Kreia who was both a Jedi Master and a Sith Lord, but it's also heavily filtered through her agenda to the point where half the Wild Mass Guessing for the game is debating which of her words were true, which were half true, and which ones are false. Atton also hangs an ugly lampshade on the Jedi tendency to lie and shamelessly manipulate non-Jedi when it suits them which is how he justified torturing them to death for a paycheck.