“But who would keep us safe if there were no police?” A better question to ask is: “Does the police actually keep us safe right now?” Or perhaps: “Why is it that safety and managing harm is monopolized by an inherently violent apparatus?” The fact of the matter is that the police do not deter harm; they react to it in a violent way, by inflicting physical violence or caging someone away.
A reform is badly needed, as well as psychological testing (along with other tests) and actually having them be liable for their actions.