most nations with gun control do not need people to protect themselves against police violence. that's the real problem here.
and china. police in china generally is not armed. (china may or may not be considered a developed country, but i think that distinction is irrelevant. i am pretty sure there are more than three countries in the word where police is not armed, or where armed police is a distinct unit used only for specific tasks where arms are needed). but that wasn't the point i was making, rather, in most countries police simply does not get violent, nor do they have to fear being shot at, because of gun controls.