Yes, much of Western Europe has lower crime rates than America, and definitely far less incarcerations... but this is due to myriad of factors, not just gun control. In Switzerland, everyone's packing heat, and crime there is quite low.
It's been mentioned, but Europe is more ethnically homogenous, which sadly makes a big difference. As well, the socialist policies give a comfortable pillow to the poor and makes them less likely to commit violent crime for money.
That said, I'm still on the fence for gun control. I'm all for the rights of people to defend themselves or their property, but I suppose I'll try the Devil's Advocate, since it seems there's very little support for gun control here. The purported benefits of lax gun control really only shine through when almost everyone in a population owns a gun and knows how to use it, and I'm not sure that many people would go out and get a gun. I mean, it's not that difficult to get a gun now, and very few people have them.
I'm sure that most second amendment advocates are very responsible with their firearms and genuinely do just want them to defend themselves and their families, but that's just not the case for lots of people. Guns act as a major deterrent, but once that line is crossed a series of vendetta action is easily triggered to the massive detriment to the community. In for a penny, in for a pound.
I'm all for guarding against the tyranny of government, but at the same time, I worry that people forget that they do not live in a democracy but a republic. There are democratic principles, but you are governed by law, not the majority. You can't say that if a large number of armed citizens overthrow the government, then maybe that's what the people want. It doesn't even take nearly a majority of people to do that, it only takes a relatively small amount of people willing, and the rest of the population to be indifferent or with too little invested to defend the government. It's not the interests of the majority that govern our nations, because those interests are incredibly dangerous to the minorities who don't agree with the majority. Our nations are governed by the rule of law, which should be overturned by a bunch of armed citizens (well meaning though they may be) who think they know how to run the country correctly.
Obviously I don't think that a lack of gun control will somehow lead to an uprising, but Second Amendment advocates keep saying that guns are also for guarding against the tyranny of government. If everyone has guns than what do governments use to enforce the law? Tanks? We've vested in the government a relative monopoly on violence such that they may enforce the law of the republic.