Earlier quoted context omitted.
In countries where people are nicer to each other, there is less police brutality. It would take much more time, but I think more Fred Rogers and less GI Joe (or whatever their current equivalents may be) is likelier to provide a more lasting fix than any of these short-term policy proposals. WWJD?
So how do you make people be nicer to each other?
(I don't think one can make people be nicer to each other. At best, they can experience for themselves that things go more smoothly once nature is not red in tooth and claw, and decide to be nicer. That said, legislating morality does work better than one might think: it allows people who might already go along with the legislation to claim to their in-group that they still don't really like the out-group, but are only going along with the law.)