You're saying it can't change? That's nonsense. You simply have to build a system that doesn't tolerate it.
You can't do that until you dismantle the existing system. And yes part of that is reallocating responsibilities for things currently handled by police to different bodies, but part of it is also reassessing the actual role of police. Because most of the stuff cops do isn't fighting crime or preserving public safety in any meaningful way, but protecting property and preserving social hierarchies and they can't do that without the tacit approval to commit violence against citizens.