This is a misunderstanding of the psychology behind the unrest. Feelings of unfairness and unjust persecution (relative to other people you live around) is what

This is a misunderstanding of the psychology behind the unrest. Feelings of unfairness and unjust persecution (relative to other people you live around) is what motivates social unrest. And not just unfairness in Black/Arab vs non-Black/Arab statistics around police killings. Perceptions of general unfairness (e.g. being mistreated by police but not killed) build up over years and then you have a straw that finally breaks the camel's back. The straw is relatively unimportant in the bigger picture. It's just a catalyst that multiple people with the same built-up feelings can rally around. In order to have a protest movement, you need an acute emotional trigger that's shared by everyone at the same time. Otherwise it can't get started because the anger is too diffuse over time.