You don't have to hate minorities to not prioritize fixing problems which predominantly harm minorities. People focus on problems which affect them, because there are a lot of problems worth fixing.
So when there is a police department staffed primarily by the most powerful demographic, it is pretty clear to marginalised people that they're not prioritizing the problems that reinforce existing systemic barriers put in place by people who... maybe did hate minorities at least a little.
So then those people affected by the continuing problem find ways of bringing it to the majority's attention in ways which are less likely to be ignored. This one was pretty successful, and even better, didn't cause anyone physical harm in the process.