Only two countries in the world have police who don't carry guns in regular service. Those are UK and NZ.

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.