I hear this a lot, but I have a really hard time imagining a functioning society with no police. A society can't function (pretty much by definition) without law and order and law and order has never existed apart from some policing apparatus (at least not for anything besides the simplest of civilizations). Our police are surely suboptimal, but I don't see any sense in the idea that we would be better off with no police at all.
Through I don't think this is the case for any democratic country.
In the end bad police is normally better for larger societies then no police at all.
But at the same time bad police can do a lot additional damage. I.e. it keeps some sources of danger in check but at the same time adds a new source of danger.
Which is, I thing, one reason why some people believe they can do without police. The other reason is the thing below:
Law and order exists just fine in small isolated (but not simple) societies without police. Especially if the society mostly contains similar minded people.
Additionally you need neither law nor order in the modern sense for a small isolated but we'll working society. A common goal, respect for other people and implicit traditions can be enough in that case.
I also can thing of at least on model for a larger society working without police through some form of self policing and self survilence but that's much more distopian than the US system as far as I can tell.
My personal take is:
Police is conceptually good, but in practice can be be anything from net bad to net good. And while you can give a label per country. Differences in the same country (and state) can be huge. If many bad cases exists there is dangerous failure in the system. While for view cases is most often a human failure. Lastly it's currently net bad to be associated with police for PR, independent of wether police is net good or net bad in the US.
Tbh. If I'm not wrong then the problems in the US are much deeper and systematic then "just" degrees of police violence. I still remember that since states used or still user a KI system to decide about bail cost and possibility which had a very clear bias against black people. Not because it was made intentionally with a bias but because the data of all cases of recent years was subtly but consistently biased against black people. And there are many other things wrong. Some not specific to black people but anyone which had not much Mony. Bring them all together and you have defacto systematic discrimination.
Edit: Spelling on a phone can be hard. ;)