It's the deterrent factor that keeps that ratio low. Carrying a gun will also but it also increases the chances of being accidently shot. I know you'll probably say that chance is low but so is my chance of being robbed, raped by a homeless person with the cops around.
See my latest post, Trump people have gone over the cliff.
It is impossible to find anyone that supports any part of the extant political system that hasn't fallen off a cliff. See my latest post. And get strapped.