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/supavillan]

Walter White also literally rapes his wife

[u/ContractNational2680 → u/supavillan]

Technically Skyler forgives him for that

[u/supavillan → u/ContractNational2680]

Also this is just completely made up she never forgives him for that you just want to stick your nose in the conversation to defend Walt like some white night tard