I did not know this. All I saw and read about were when the police would see a person on their roof trying to protect theirs and the rifles were confiscated. I was angry over that. Now, if the police just bypassed due to not having to worry about that neighborhood, then great. but, if only because of the mass of armed people, my faith would then be shaken.
If you google, you will come across the big stories about the racists white people of Algiers Point that shot poor, innocent black men and turned away flood evacuees from their ward that was spared any flooding but there were other neighborhoods too that barricaded themselves to prevent looting.