It's not scary at all and is in fact completely understandable.
Basically until World War I, for the vast majority of people, you either killed or you died. Even during the 1600's, arguably the beginning of "civilization" as something where violence was not commonplace, people still fought highly ritualized duels, countries still invaded other countries for the express purpose of taking their shit, people took and kept slaves, nations conquered and plundered and stole and all manner of violent actions. The only way, at the time, to stop your shit from being taken, to stop yourself being conquered and enslaved, was through violence.
If you were strong, you survived. If you were weak, or chose to be weak, you died. Those kinds of instincts were bred into us over tens of thousands of years of evolution, ruthlessly and yet apathetically selecting the strongest, most violent, people to carry on their genes. The guy who got to fuck all the women was the guy who could club all the other men on the head the best. Violence, and willingness to use it, until recently, was strongly evolutionarily selected for.
It was really only World War I and II that changed that. We got so fucking good at killing that we decided: hey, maybe lets try another way. Instead of having violence be the domain of all, where our nations raise vast armies of conscripts, let's instead have small, professional armies well supported with things like tanks, aircraft, machine guns, artillery, night vision, etc. They actually work better.
As a consequence of this, the vast majority of our citizens are now peaceful, but our armies are, in terms of overall ability to project force, more powerful than ever. The Roman Legions at their absolute height would get massacred by even the US Coast Guard, let alone the full might of the US Military. It would be a laughable massacre where I would fully expect 0 casualties from the US forces (excluding illnesses, accidents, etc) and 100% casualties from the Roman legions, assuming they fought to the last.
This is a change that's taken place over less than 100 years. That is a tiny blink in an evolutionary time period. We haven't changed and won't change for thousands of years because there's no evolutionary pressure on us to do so.
But, you know, I figure I should end on a slightly more upbeat note.
As much as "to the victor go the spoils" applies... no man rules alone.
A single man, no matter how powerful, no matter how violent or manly or tough, is defeated by many smaller, weaker people. Refer, again, to my example of the modern US Coast Guard versus the ENTIRE Roman Legion.
A single man cannot build an Apache gunship--and that gunship will fuck anyone. A single man cannot build a tank. A single man cannot build the complex logistical network to fuel an aircraft carrier, let alone maintain it, supply it with aircraft, sail it, coordinate strike missions, and generally put warheads on foreheads. A carrier-based strike mission to drop a single 500lb bomb requires the combined efforts of literally hundreds of thousands of people, probably millions. Just to deliver one bomb.
But, like I said, nothing can stand against it.
So. In the small picture, individual might makes right, but in the much larger broader sense, victory belongs to the cooperators.
As long as those cooperators put their collective talents towards fucking shit up.