Allow me to offer you a bit of a reframe - for 97% of human history we had social mechanisms that kept violence to a minimum. This did become more difficult as population density increased, but the real issue is the rise of patriarchal dominance hierarchy systems - only about 6-9k years ago - not inherent animalistic violence or tribal competition. All mammals are reluctant to kill each other (soldiers have to be trained to do it) and even in early cities and kingdoms, people employed various mechanisms of cooperative control. The mayor or king had little actual power outside of their immediate line of sight.
This is not to say that we can easily correct where we are now. Dominance hierarchies are both insidious, and deeply interwoven with things like predatory capitalism, and white supremacy because they are all systems of domination. But, they also aren't the way things have always been, and in fact are quite out of line with how humans lived most of their existence. Countries like Denmark and Sweden aren't perfect, but they do show that it's possible for modern Western democracies to do better and still have strong economies. We could move in that direction if we wanted to. The problem is, actually wanting to. I'm reading some books right now about how we can begin to bring this about, so hoping to write more on that soon.
