The white liberals want feral blacks and other "minorities" to attack working and middle class whites (while leaving liberal elites in their gated communities safe and secure) because it creates an excuse for the elites to consolidate their power through gun control, government surveillance, and an expanding welfare state. In contrast, black radicals like Obama probably encourage the rioters out of pure, raw racial hatred.
Regardless of motives, the results are the same for us.
Your last line is sadly very true.