The EU doesn't have armed criminals like the USA. The EU also doesn't have police being killed by criminals. It's close to 50 to 1.
Well... the sicilian mafia comes to mind... the french can be quite violent too... Western Europe is not so bad either, with guns.
I guess you mean "normal" non-criminal people in the EU are not allowed to have AR-15 assault rifles in their homes, that they can use if they have mental health issues.
I personally believe that is one of the reasons the USA has so much gun violence. Get rid of the guns in people's homes and things will change for the better.
I mean ... look at this ... Only in the USA!
https://dimages2.corriereobjects.it/files/image_572_429/uplo...