Isn't the goal to see that all have their rights, though? Certainly the travesties of justice that many African-Americans suffer daily are at least on par if not worse than getting a store trashed (having your livelihood destroyed, vs. having the opportunity to make a livelihood proscribed, and occasionally your life taken by bigoted cops) but that doesn't diminish or justify reckless and lawless destruction.
Our society spent centuries creating and maintaining the status quo of a class of people with nothing to lose and no way for most to be invested in that society, so it is harder to blame, but still the rioters aren't blameless, they did choose to do what they did.