Guns come with downsides, true. But so do a lot of freedoms. Alcohol? Do the benefits of alcohol outweigh the downsides? I would argue alcohol has an even worse impact on society than guns. Of course you'll say "yes, but regulating alcohol is impossible, at least regulating guns is feasible". Yet, we can sleep at night knowing our favorite vice kills tens of thousands every year in the US alone (not to mention the mental health issues and child abuse that stems from it...).
Education is effective. If education is an effective tool to combat alcohol abuse, it can be an effective tool to combat gun abuse as well.
Europe should want guns even more than America. It wasn't that long ago that Germany was blitzkrieging across borders and the citizens were defenseless. It would have never worked in America because as soon as the Germans drove over the border, millions of American civilians (not soldiers) would be pulling out their family rifles and gunning down the German soldiers from every side.