Become a thief in the night, become a dog on the run?
Have I fallen so far, and is the hour so late,
That nothing remains but the cry of my hate?"
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- Child Ballad 54, "The Cherry-Tree Carol",
"Oh, what have I done, Lord?
- The bandit in "Bonnie Banks o'Fordie" has one when he learns that the girl he just murdered is his sister. It ends with him stabbing himself.
- Freemans Mind gives us this line during Half-Life's 'Resonance Cascade Incident':
- In Clear Skies 3, Hausmann does this during the final battle and surrenders rather than see more of his people killed.
- Church of Red vs. Blue suffers this when he realizes that the reason he's dead is because he tampered with the tank by disabling the friendly-fire safety.
- A rather disturbing example in the final episode of Arby 'n' the Chief. After Arbiter literally rips Chief to pieces after learning that Chief killed Cortana, both intentionally and by accident. Things only gets worse for him when Tyler shows up planning to kill them both after revealing that Eugene committed suicide. This hits Arbiter so badly that he starts mumbling the montra "I'm in my happy place" over and over again. It gets even worse for there...
- Magic: The Gathering: In Judgment, Kamahl pulls a "Dear Fiers, what have I done?" (with a nice, hearty Big "NO!") after mortally wounding his sister Jeska in a fit of Mirari-induced temper.
- Warhammer40000: A lot of people who are being mind-controlled by the Chaos gods are only able to break free immediately after they've done something they really shouldn't have, such as betraying their adopted father and dooming the galaxy to an eternity of war or betraying their entire legion and mortally wounding their adopted son.
- Corax, the Raven Guard Primarch, went through a catastrophic moment like this. After the Isstvan drop site massacre, most of his legion was decimated, so he ordered some questionable methods to rebuild the legion. His orders left a lot of the recruits as mutated monstrosities. The situation was dire enough that he personally led them to their glorious deaths, those unfit for combat serving as a literal meatshield for those who could still fight and afterwards locked himself away for an entire year praying for their souls and his. In the end, he took his ship and flew it straight into the Eye of Terror, his last words being simply "never more".
- Part of the meltdown of Acro in Phoenix Wright: Ace Attorney. You don't actually see the moment onscreen but the aftereffects are obvious during his breakdown. In attempting to murder Regina he accidentally killed her father, to whom Acro and his brother owed everything. As Sympathetic Murderers go he's high on the list.
- In Phoenix Wright: Ace Attorney - Dual Destinies , in the DLC case, Marlon Rimes is quite similar to Acro. His girlfriend died during a performance a year ago, and he believed Orla the orca whale was responsible, not knowing that 1) His girlfriend had a heart condition and 2) it was an entirely different orca. He tried to kill Orla by draining the water, but Jack Shipley, the owner of the aquarium and his boss, rushed out to save her, slipping and falling in the empty pool in the process despite Marlon's attempt to save him. Marlon tried to frame Orla for Jack's murder, but ultimately realized the truth of things and had this reaction. Thankfully, after it's pointed out that he tried to save her, he decides to make amends, however long it takes.
- Archer from Fate/stay night as revealed in UBW route. He is trying to kill Shirou, himself from past, because he wants to prevent him making a pact with world to protect people, because it'll only make him one who kills some to save many.
- One of the extended bad endings in the PS2 version of School Days has Kotonoha murder Sekai in cold blood and then offer herself to Makoto, who was watching. Makoto's horrified reaction causes Kotonoha to realize what she has done, and she breaks down in tears.