Oh man, I heard about that but didn't think it was legit. That is nuts.
I think those protest/riot crowds are composed of people of many motivations.
People tired of police abuse.
People who want justice for George Floyd and other victims.
People who see the inequalities in our system.
These groups are legit and primarily comprised of peaceful and possibly angry people.
Then you have;
Looters who want free sh#t.
Vandals who want to cause mayhem.
Groups that want to cause mayhem for various ulterior motives.
People that are fed up with quarantine or bored and want to party.
Slaves of social media who want to say they were there and share the proof.
When the latter group starts to get out of hand it incites the angiest in the former group to join in. Then likely the most deserving peaceful protesters leave for safety and because their message has been co-opted. And then the racist aholes who don't recognize there are real issues blame the wrong people and nothing changes until things get way too bad.