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“okay but he was a villain and had to die”
your implication states that eri should also be responsible for the grooming & manipulation that she faced with overhaul. whether you like it or not, eri and shigaraki parallel in various aspects but mostly due to the the type of abuse they suffered. the message that tomura was too far gone to be saved doesn’t really make sense though but it does track with the words that twice said “as for the people who heroes like to save, yeah. they’re always good and virtuous. there’s no place in society for an insane guy like me”
the only difference was that eri and tomura shigaraki (tenko shimura) is that eri was stumbled into izuku and mirio & written as someone who could be saved primarily due to her age. eri and shigaraki are two sides of the same coin and she could’ve ended up JUST like him if she didn’t run into izuku and mirio.