JFC you fucking wilfully ignorant troglodyte!
People are rioting because they're sick of being mistreated/killed by police who get away with it. This has going on for years, it's just that recently more incidents have been caught on tape.
Cops who commit murder are rarely investigated let alone punished in any way thanks to the blue wall of silence and a system which lets cops get away with murder(literally). Doesn't help that officer testimony is almost always taken as gospel.
A civilian who goes around killing others will usually be investigated, arrested and jailed.
A bad cop has the power to easily ruin and even end the lives of innocent civilians and get away with it.
The phrase "with great power comes great responsibility" is foreign to racist troglodytes like you isn't it?