The cause of "social justice"?
In a world without higher principles, who cares about social justice?
Without something to gain personally, no one will riot except those few people who want to use this as an excuse to steal something.
These are self serving people. What self is served by protesting this?
"Stealing something" is the personal self interest that motivated most of the rioters in 92 and the Katrina looters. Another commenter pointed out that they chased almost all the business out of their neighborhoods and they would have to go too far to do any serious looting. That and more storekeepers have guns in their establishments and are more likely to use them. Many if not most of them have seen vids of the LA and Miami riots and have been impressed with the Koreans' and Cubans' guns and readiness to use them. Like the great majority of such people they are not Big Brave Men out to Face Danger to Right a Wrong, they are looking for safe easy loot, not dangerous loot.