The US is quite unique as far as gun ownership and gun usage is concerned, so it would be impossible to draw meaningful conclusions from a comparison between the US and Europe.

I live in Belgium and gun ownership is rare, but gun usage by the police is rare too and strictly regulated. For example, the police are not allowed to draw a gun on someone wielding a knife in Belgium, because that would be a disproportionate amount of violence. Because it’s a rare occurrence, every death by the police is covered in the news and from the past decade I can only remember 3 deaths by the police in the past decade, of which only one was by guns. There could have been more of course, but our number of fatal police shootings is almost negligible when compared to the US.