The world is a deadly free for all the time. But productive people that don’t have their wealth stolen by government (warlords), aren’t told what they can and can’t do by government, can live much more productively and naturally. Defense of private property is simple and natural at the individual or familial levels. But hiring professionals would mitigate warlords in a free and open society.

It is easier and more profitable to defend property than to try to take it. So defense companies have an asymmetric advantage and can outcompete (and make profit doing so) attackers.