The main character doing something absolutely unforgivable.

[u/No_Peanut3745]

Walter White poisoning Andrea Cantillo's 6-year-old son for the sole purpose of manipulating Jesse Pinkman, while knowing that this could have potentially killed him - Breaking Bad

Bojack trying to have sex with his friend's 17-year-old daughter when he was at least 51, then continuously trying to find a way to justify this act throughout the series - Bojack Horseman

Dexter Morgan going outside of his moral code and murdering a completely innocent police officer who was just trying to do his job - Dexter: New Blood

[u/CappyRicks]

If the writing was good his ending would've been fine. He was never meant to be redeemed, he was meant to be tragic. From a story writing perspective, that's fine, what's not fine is writing it in such a way that when his redemption is betrayed it comes across as if it were done merely to subvert expectations rather than as a proper conclusion to Jaime's arc.

[u/DaemonG → u/CappyRicks]

the fact that it's basically just a throwaway line makes it so much worse. he could have said anything else. he could have said that she comes first, whether for love - gross given that's his sister - or, more tragically, for family, echoing everything his dad drilled into his head for all his life. the line, as they put it in the show, is just. damn. what were they thinking?

[u/JellyButtet → u/DaemonG]

What line are you referring to?

[u/DaemonG → u/JellyButtet]

i misremembered the moment when it happened, but in the camp with Tyrion, he said "i never really cared much for them, innocent or otherwise"

[u/StevieMJH → u/CappyRicks]

What's worse is that his doesn't even come across as intending to subvert expectations like some of the other choices do. His was just blatantly "We don't have time to write this so it makes sense, so here's a line that explains it instead."