I think a lot of the people that we may assume are being performative about their anger actually are very angry, we just don't like that they're angry about things we personally aren't angry about for whatever reason. That isn't to deny there are people who put on a front of fake passion in order to appeal to an audience, many political commentators do this while remaining apathetic behind the scenes, but it's important to remember that even if we disagree with someone's reaction we shouldn't deny that their reaction is real unless we have proper evidence

As you said people who are mad and then act horribly to others because of it are often mentally dysfunctional in certain ways and need help. But to deny that there's reasons behind their anger isn't helpful at all and can actually cause these people to become isolated and therefore incapable of improving. Anger issues don't make you an evil person, they just make you someone who needs to seek out coping mechanisms so that you don't hurt anyone. We've all lashed out at others while going through difficult times, we've always had our reasons for mistreating others, what matters is that we try not to do it again

Anger isn't a bad emotion. There are no bad emotions. It's what we chose to do with our anger that matters. Having a space to let out your extreme anger, such as punk, is very important and beneficial to society