Uhm... when the 3rd precinct got burned down and George Floyd's murderer faced charges the next day? Cops don't normally face charges for murdering black men in broad daylight, so I don't take the timing of arson and charges as coincidence.
Of a cop murdering a black man in broad daylight and not getting charged for it? Hell, here's an example I just pulled up for someone else of a 12 year old black kid being murdered while he played airsoft in the park[0], the cop faced no charges and was subsequently hired by another police department in the same state. It's like paedophile priests getting shuffled around by the Catholics, absolutely absurd.
You want another example of riots leading to change? The Civil Rights Act of 1968 was signed into law during a storm of riots that had broken out following the assassination of MLK.