I'm not saying they exist everywhere else; I'm saying that where people have the right to weaponry they don't go around shooting each other except here. Look at the number of guns owned per person in Canada - yet they don't go shooting each other over what music someone is playing in their car! That kind of gun violence, or shooting up a dorm full of women because you couldn't get as laid as you felt you should have been, takes an American sense of entitlement to not have to put up with annoyance, an American sense of violence as an acceptable response to annoyance, and an American attitude that shooting people who annoy you is something to be proud of/aspire to.
It is not the legal right to own the gun that is the problem.
Many, many Americans are legal gun owners and not over-entitled, trigger-happy would-be cowboys.
Criminalizing them doesn't make the problem people any less overly entitled, less trigger-happy, or less cowboyish.
The attitude is what needs to be addressed.
Nobody has the right to happiness. Nobody is entitled to use a gun on someone who has merely lessened their happiness.
Making guns illegal won't deal with that stuffy and arrogant attitude any more than making cigarrettes illegal would detract from the Marlboro Man's appeal to popular American culture. Make smoking uncool and it diminishes as a problem.
If we could make shooting people a shameful act...
But oh, yeah, we're not allowed to shame people any more.