[ugotme]

Because some - not all - of these people are there to create havoc.
I would venture that a lot do not know the "victim" and could care less about him. All they want is to riot and steal.

Some honestly believe there has been an injustice.

I certainly do not have the facts and can not make an intelligent decision from where I sit. However, the Grand Jury has made it's decision and we (they) must live by it.