I understand that it's the situation that has bred this kind of behaviour, but it's inexcusable - whether they're angry at the police or the government, it's gone so far that they are genuinely destroying the lives of innocent citizens.
These people have no morales, no fear, and to them it's just a game. The problem is the police currently don't have the manpower or the cellspace to arrest every single one of them, which is no less than any of them deserve. A mask and a hood shouldn't protect you - if you are out in these crowds rioting, you should be considered an accomplice and charged with the most serious crimes the mob have committed. Currently it doesn't seem like the police are giving the rioters enough incentive to stop and go home.