You certainly do have a point. I'm Swiss and our gun ownership clocks in somewhere after USA and Canada, yet violence levels are about the same as in the rest of Europe. It really seems to have much more to do with culture than with guns themselves. However, defending this position must be quite tough as an American. It means that there is something inherently violent in your culture.

Maybe there is a correlation with suburban car culture? First there is the significant correlation between environmental lead during childhood and violence, secondly I think that having a low population density might make people feel more on their own, the highest goal being to protect their family. I'm thinking that people that are used to a high population density, who are in contact with hundreds of other humans a day, get used to this and lower their defenses. Then again I've seen a study suggesting that the violence leves in cities and on the countryside is pretty much the same (at least after lead levels have evened out).

Maybe, hopefully, the decline in violence in the US will continue and it will level out at a similar point as Europe / Asia - then we'll probably know that you were just poisoning yourselves with lead. I hope that this will have some impact on limiting the power of lobbies. Think of how much lead gasoline, lobbied into the world by the oil and car industry, has cost society, if this really was the main cause of the 70ies / 80ies crime outbursts.