Diuretic
Permanently confused
The US is a violent society, even without consideing the catagory of firearm related crimes the US is violent. I do not know about Germany and do not want to dig into statistics but firearm crime in England is on the rise despite the strong restrictions.
The British Police Officer, once proudly boasting of carrying no firearm is now usually armed whereas the citizens are disarmed. Certainly the changing society, bad economy and the easy travel across boarders are factors. The firearm laws in Britain have become draconian and of course a similiar question to yours above would be to ask where is the proof that a disarmed British population has reduced crime?
Law abiding people who own guns do not commit crimes because they are just that; law abiding.
criminals however commit crimes with or without guns because they are criminals
So at least In America we have a choice other than to wait until the government shows up to stop us from being victimized by a criminal.
Police cannot prevent crime they can only react to it after the fact.
So if it makes me a violent American because i would rather shoot some fucking scumbag who tried to threaten me, my family or my property then God Damn it I am proud to be a violent American.
So you can cower in a corner while some criminal robs your home or beats you to a bloody pulp rapes your wife and daughter and kills your dog and pray the cops get there in time to save you. I'll shoot the motherfucker crack a beer and let the cops clean up the mess.
The cops will outsource the cleanup - they might send you the bill though

Where there is a high chance of someone being subjected to an armed intruder it makes sense to have householders arm themselves. Factor in an ineffective police force in the area and that "makes sense" goes up by about 100. And you would be morally right (hopefully also legally right) to shoot that scumbag.