That is also a factor, but I'm going to interpret this as tell-tale signs of a breakdown under economic stress.
I can't see a train of thought that starts with a century of injustice and ends with "therefore I should loot Target". I can very easily see a link from "I can't afford stuff because my job just vanished" to the burning and looting.
[0] https://en.wikipedia.org/wiki/Twin_Cities_protests#Day_3:_Ma...