If somebody really wants to, they can get their hands on guns either way. The thing is, there's a lot of gun accidents and impulsive actions. You can't get your hands on guns on impulse if there's some kind of regulation. There are situations where it would be cool if there was a 'good guy with a gun', but most of the time it seems that the 'good guy with a gun' would only make ˚˚˚˚ worse. I'm kinda in favor of complete abolishment of guns but that isn't very realistic and probably not a good idea anyway, but requiring a gun license is the least one can do. Also, gun regulation has shown to kinda eliminate those shooting events. It's not merely an 'impulsive reaction', it's a solution that has shown to work. Australia: they had 13 mass shootings in the 18 years before they passed more strict gun legislation, none in the 17 years after. "The rate of homicides involving firearms per 100,000 population in 2009 was 0.1, as compared with 3.3 in the United States. The rate of unintentional deaths involving firearms in 2001 was 0.09 as compared with 0.27 in the United States. The overall homicide rate of Australia was 1.2 deaths per 100,000 for 2007-2008, as compared with 4.8 per 100,000 in 2011 for the United States." [wikipedia.org] Perhaps it's just a United States attitude problem (although Brazil is obviously worse off here), but the fact of the matter is that the average American is four times more murderer than the average Australian. Indeed some maniacs will resort to other methods to kill people, but the number is still significantly lower.