Kneeling didn't work, soooo...
Expected respondes: pass a law. Protest peacefully. Stand in front of city hall with assault rifles. Vote for (some centrist).
Just because you may not like how someone is dealing with the fact that they could be killed with no recourse by cops because of the color of their skin, doesn't mean their methods are invalid or even irrational.
The classic star wars question - is Luke Skywalker a rebel hero, or a terrorist threat to order? Before the Empire blew up an entire planet to make a point, it was a fairly valid question.
It also demonstrates that by and large, police don't prevent chaos and property damage. Most of the time, people simply decide not to do this, and when they decide they want to, police are largely powerless to stop them. This should lead others to more broadly question whether police are capable of stopping other bad actors, rather than merely reacting to them.