Character that had justifiable and reasonable crashouts but that still doesn’t excuse the actions they have done.

D-16 (Transformers One) - Yes, Sentinel turned out to be a backstabbing traitor that made your whole life a lie, but it still doesn’t excuse trying to kill him, not out of Justice, but out of revenge.

Pencil (Battle for Dream Island) - Yes, being trapped inside an eternal algebra class for 6 years is a painful and torturous experience, but it doesn’t justify nearly ending the entire universe for the selfish reasons of not wanting to go back there again.