I feel like you've answered your own question. There were clearly some crazy people among that crowd.
Prison is probably not the place for them.
This guy was made the poster boy of the whole affair:
Somehow we've convinced ourselves it's okay to be out for the blood of people who are clearly suffering severe mental health issues.
But, hey, that's what the right does with individuals from traumatized communities and backgrounds who riot when they feel unheard, oppressed, and underserved. So a little turnabout is fair play, right? Let's take it out on these mentally unstable and at risk persons.
Sweet, sweet vengeance!