Read history. War, mayhem, death, conflict ... all occur far more frequently than peace. We are a murderous bunch. Something has to keep us in check or we would gleefully annihilate ourselves.
That “something” is God.
Curious paradox. We think we are violent but we are not. Since at least the civil war folks have been baffled. I remember reading about a Civil War General who could not understand how his men could “miss” so many shots. He put up a sheet and had the entire regiment fire at it and there were 500 holes in the sheet but when that regiment fired at the enemy only a handful of them dropped.
Fact is, we AREN’T killers. Even soldiers have to be TRAINED to kill. Only sociopaths can kill without blinking. The problem we have with violence, IMHO, is we abhor it, which is a good thing in a sense, but it turns us into victims. What we need to do is distinguish between the sociopaths and the rest of us. We let the sociopaths have a monopoly on violence. We would have LESS violence, ironically, if we “normal” folks learned to use violence appropriately (I.e. “More Guns, Less Crime”) but we just have “other things to do”.