Nothing, we are just delaying the inevitable collapse into anarchy.. Our biology isn't suited to advanced civilisations, through natural selection our biology is suited to us living in small tribes (similer to chimps) Rememer that for most of our species lifespan we DID live in these small settlements.. Its only a few thousand years ago that we can find any evidence of the start of bigger civilisations.. With these came the start of control over mass amounts of people, which lead to great things like Monarchys, slaves, wars, institutionalised religion.. This leads to all the problems we face currently, even your guns question.. There are reasons why people go out and kill people, there are not many people who live a life their body and mind were designed through evolution to thrive in..