Honestly, I haven't seen MHA, but from your metas, I'm pretty sure the true villain of the series is Bakugou and Izuku's teacher(s).
i got an ask forever ago about this topic, and god i wish i’d answered it earlier but it’s buried under 300 other asks by now. but it’s about this specific topic, and i think it’s important to bring it up
now i can’t confirm or deny this, but the ask was about how, in Japan, bullying apparently gets overlooked or completely ignored, and no one ever does anything about it; the teachers just turn blind eye towards it. so the ask was suggesting how Horikoshi was probably doing a a form of social commentary about that specific issue by making it such a big plot point between Bakugou and Izuku’s relationship.
if their teachers were better, if they hadn’t just ignored all the bullying, if they’d bothered to teach Bakugou better instead of encouraging his bad behavior, so much of Bakugou and Izuku’s relationship could have been avoided.
but they didn’t. and now it’s fueling a good majority of the series’ plot, and it’s the reason why Bakugou is how he is, with all his insecurities and problems.
not to say Bakugou isn’t at fault. he is. but he was also just a kid who didn’t know any better, and if anyone had bothered to teach him correctly, he would have.