The timeline makes it absolutely clear that the riots were due to the failure of the mayor, the chief of police, and the police in general. They were the ones who were there on the spot, and they are the ones who failed to control the situation.
According to some reports posted here, Louisiana police participated in the looting. If true, they should be punished.
Did National Guardsmen play cards? Maybe so. So what? I've been in the military, and the motto has always been "Hurry up and wait." If someone pulled out a deck of cards while waiting for orders or for transportation, so what?
What's wrong with these guys. They should be out looting on their down time. No wait, it's while on duty isn't it?