The way I've understood the "defund the police" movement's point is that they're saying police funding is excessive because a lot of the things cops do should be handled before the cops have to get involved, eg. with higher funding for mental health and social services, housing for homeless people etc. So the point is that you wouldn't need as many cops in the first place if things were handled more humanely "downstream" so to speak, instead of just letting problems fester until things go sideways