Bad premise and blatant nonsense. Humans are war like creatures. This is why EVERYONE needs to be at all times armed. You never know when one of your fellow hairless apes will do something stupid.
Also, this is aanother reason why giving one hairless ape power and authority over another group of hairless apes is a REALLY bad idea.
I don't disagree, but that is not the entirety of the answer.
I think societies tend to be modeled on some insect social order structures, with the soldiers at the periphery to the outside world, and the ones to be protected in the interior.
Warfare and violence in today's world makes this simple concept difficult to achieve. There are no safe places.
The situation devolves to what you describe, and we see it in Israel. Armed soldiers and citizens are everywhere, ready to respond to the inevitable attacker.
Our stroll out of the valley is turning out to be a longer one than we had thought it would be.