In 90% of the USA, mall cops have a cell phone and a walkie talkie. They won't give em a pistol, let alone a rifle.
That's the problem with international news. You guys only hear about the most interesting or worst things about the USA.
In the USA, kids have an infinitely higher chance of getting struck by lightning or killed by a car crossing the street than they do of getting clipped in a school shooting.
The US crime statistics they put on the news are inflated by labeling gangster on gangster violence (drug deals gone wrong...) as "youth gun violence." Obviously 19 year olds popping each other over stolen drug money isn't "youth gun violence," it's organized crime. But it sounds more interesting to report it as such.
In the news: if it bleeds, it leads. So it's impossible to get an actual view of the USA from international news.