As a teacher in the U.K. I find it so hard to understand the mindset in America of the gun culture generally. We had one mass school shooting around 20 years ago - much stricter laws came in and we have had no more since. Most people simply do not own a gun and do not feel the need to. Some still go hunting or to rifle ranges but it is much more closely monitored. Of course some criminals still have guns but not many. The majority of police don't have guns (my husband was a police officer). Our biggest concern over here at the moment is knife crime - still deadly and takes the lives of innocent teenagers but at least it cannot easily turn into a mass incident as with shooting.
If I was asked as a teacher to have a gun etc I would refuse but perhaps it is because we have a different culture here.