The problem isn't really the legal guns per se, however, having so many easily accessible avenues for legally obtaining assault weapons is bound to increase the number of "bad guys" who also get them. You basically create an arms race among the citizens and it would be really hard to convince me that makes for a safer country
I bet many weapons that were illegally purchased were at one time obtained legally.
The whole weapons thing seems to be cultural in America. I'd still live there just for the weather though...