When poor people all commit poor people crimes at the same times we punish them harshly. See the riots last summer. When lots of rich people commit rich people crimes at the same time, they expect to get away with it.
I feel this cannot be pointed out enough.
The other thing I feel that has been ignored is that as soon as law enforcement turned up properly the poor people all stopped rioting. When law and order arrives for the rich they all make excuses and continue as before.