A fair enough question. First of all, no one actually *likes* riots unless they’re ANTIFA or whatnot.
The issue is we have to understand where these spontaneous outbursts of violence come from, and how to end them.
In this case, the immediate cause of this destruction was obvious: a gruesome police murder in broad daylight captured on camera and seen around the world. This experience of mistreatment at the hands of police resonated with many black Americans who have been treated, if not quite this poorly (as after all, they are still living), then still pretty badly.
The even more fundamental cause is the centuries of racist mistreatment, segregation, and ghettoization that leaves many black Americans feeling like America’s promise isn’t and has never been for them.
MLK had even better words on this subject; I’ll post them.