I think that e answer is that the rioters believe that they have nothing to lose. They have no property. They have no jobs (living off the dole). They have, for all intents and purposes, no home (living in public housing). So, they riot.

I think a behavioral economist would generally state that a rational person acts in his/her best economic interest. In the case of the Baltimore riots, they have no economic interest in keeping the peace. So they riot.

If we gave the rioters an economic incentive to be peaceful, they would be. The gangs in Baltimore famously entered into a truce. Why? Because having a peaceful city makes them better off, i.e., it is in their interests.

So, how do we stop riots? We institute a system that disincentives rioting.