Self-awareness means a lot, and effort. A lot of the time good acts change to bad ones in peoples perception because their motives are revealed to be impure. A character I’m quite fond of in a fairly mainstream book is a goodboy for two books before really digging into his backstory where he was a psychopathic warlord, burned his own wife alive, and seriously considered murdering his brother for power. He is still considered good by the Fanbase because he is actively acknowledges his bad actions as bad and wants to do better.
If someone instead tries to justify or dismiss their actions, it gets a lot more grey but most people won’t condemn them unless they were galactic mega Hitler or a gaslighting and manipulative love interest. Certain kinds of evil seem to cancel out all good in the audience’s eyes, and being manipulative/untrustworthy towards sympathetic characters for purely selfish reasons is pretty up there. It makes every good act into an outgrowth of the evil plan. Being in a death game and cultivating a bunch of other contestants (through acts of kindness) to join a team so you can use them as gullible meat shields, for example.
If someone instead tries to justify or dismiss their actions, it gets a lot more grey but most people won’t condemn them unless they were galactic mega Hitler or a gaslighting and manipulative love interest. Certain kinds of evil seem to cancel out all good in the audience’s eyes, and being manipulative/untrustworthy towards sympathetic characters for purely selfish reasons is pretty up there. It makes every good act into an outgrowth of the evil plan. Being in a death game and cultivating a bunch of other contestants (through acts of kindness) to join a team so you can use them as gullible meat shields, for example.