Eons ago, when everyone lived at more or less the same level, conflict based on control of resources and territory was a more or less animal thing, augmented gradually with various hand tools that might give one side a temporary advantage until their opponents figured out something equal or superior with which to retaliate. But, no matter who won, the big enemies were still famine and disease.
As technology advanced, unevenly, it made all aspects of life easier in places that possessed it, so that those cultures expanded more readily, dominating less technologically advanced cultures regardless of the ethics and morals of a given invasion. Technologically dominant powers probably inhibited the advancement of cultures they dominated. The evolutionary compulsion to advance tribal interest evolved into national interest, and imperialism. It was still the same basic urge that had inspired some hominid in a snit to pick up a rock or a jawbone and bust an adversary's head.
All the way up to World War I, disease still killed more warriors than actual battle did. Then improving medicine and killing hardware shifted the balance in war so that combatants could finally claim the higher score.
Setting aside mass slaughter for a moment, early hominids and primitive humans faced risk constantly. Risk takers served as test pilots for the species, advancing the frontiers of capability or providing grim lessons in what not to do. Our respect for risk takers probably predates language. But so does our eye-rolling amusement at generations of Darwin Award finalists, from long before Charlie D walked the Earth.
We can't control or predict earthquakes. We can observe hurricanes and predict their approximate course a few days in advance. We can home in on outbreaks of disease and try to contain their spread or develop vaccines. With eyes in the sky, we can give a few minutes' warning of tornados. We can advise people how to drive safely, and to avoid lifestyle habits linked to disease. But we can't predict exactly when someone will snap and start shooting, or when a nation will lose its grip on global citizenship and start a war inside or outside its own borders. You can say roughly, observing trends and monitoring communications, that a nation presents a risk. On an interpersonal level, you can sometimes tell -- or at least guess -- that someone is volatile.
This unpredictability in human behavior, combined with the long heritage of risk, gives our species a paradoxical yearning for safety and an unwillingness to commit to being safe. Most of us like to be able to move around without constant vigilance. For most of my life, this country seemed like a place like that. Of course I wasn't black, or an unaccompanied woman, and I never ventured into a bad neighborhood. Stuff happened, but it didn't seem as common as it does today.
Personal violence and institutional violence are the micro and the macro of humanity's danger to humanity. Our disdain for the natural world may manage to take us out before we dissolve into global combat. Or we might dodge the bullets both metaphorical and actual, and get our shit together. But the biggest threat to our safety is our belief that safety is impossible. We can't be sure that enough people -- maybe even all people -- could ever be willing to live and let live. We are not yet "all in this together."
With the technology at our command, there is no good excuse for human suffering. We have fear and anger in the world because we accept it.
All that is required for good to prevail is for bad people to do nothing. Focus on a common good that stems from energy and willingness to work, decoupled from grasping material ambition. Hold your temper. Disconnect your jealousy. Evolution beyond the weaponization of technology will require a level of conscious thought. It may prove impossible. Utopianists in a hurry will try to slap together a rule book full of begged questions that they understand intuitively, but vulnerable to interpretation.
To begin the process at all will require a general consensus that we will quit hurting each other. That one step has tripped us up for thousands of years. Rather than reach the point at which appreciative existence becomes our mission, we endure the constant clash between dark and light, the good people and the bad people doing things in opposition. If that's what we're stuck with, there's really no point in going on.