I don't but my son does and I visit frequently. I also live in a huge country with a lower population density than the US. We manage very well without gun toting vigilantes.Not sure if either of you live in America but the reality is a little different than the hysteria online. I'm all for way more gun control and regulation as we sure as hell need it but you should know
1) the AR-15 style rifles are not in any way "assault rifles" despite what media may have you believe. You'd think they're some sort of M-16 or AK 47 with how it's being discussed
2) America is huge and if you haven't lived here you may not be able to fathom the size. Police presence can only be dense enough to a certain limit and in a vast majority of the country side/rural areas it's not feasible to wait for the police in emergency situations.
And not calling the AR-15 an assault rifle is just semantics as this idiots death count shows. You don't need gun control, you need a total gun ban. Never going to happen of course.