A little more context up front would've been helpful. There was mention of M16s and hand grenades too?
If we're talking countries, doesn't Switzerland require you to have a gun? And don't Switzerland and Israel require some kind of military service?
I was fortunate to have gun safety stressed as a kid (of reasonable age...), and a heritage of (guns are normal) from my dad and his dad (probably on Mom's side too, had we lived near them).
I also carried a handgun almost every day as part of my duties in the (United States) military, but even though concealed carry was becoming a thing a few years before I got out, I had no desire to do it for a number of years. Here you get into the significant differences of where you live, travel, etc. informing that decision (if it's an option). I just felt the responsibility outweighed the need in my case.
Changed my mind later though, probably around the time I found myself travelling to some remote areas, and thinking it'd be nice to carry something in the vehicle at least, and have no worry about the legality of it. I've had no trouble with the police during several traffic stops. Stay calm, tell them what you have (state laws vary here) without making any kind of move toward it, and cooperate. One deputy said "I live in [this state], I know everybody has a gun" when I told him (lol).
I don't really care to answer the original question (above my pay grade) other than to say, it's unfortunate that people with evil intent sometimes get the means to carry it out. And it's unfortunate that people aren't always as responsible as they ought to be either.
I am most pleased though, to have enjoyed the freedom to (hopefully be ready to) protect myself and family in one of the most effective ways there is, and to also have likely enjoyed something of the deterrent effect that "good" people being armed surely produces. If you're able to fight, and that's known, that's a good step toward not having to.
