The way people live in cities, all bunched up together like chickens in a coop is not the natural state of mankind.
For tens of thousands of years mankind lived in small nomadic groups. They had land to farm, land to roam, river and streams to fish from, land to hunt on and land to migrate on. Groups traded between each other, and were pretty much self sufficient.
Today, we live in cities that group people together like livestock.
What happens when you put too many chickens in a coop? They start pecking at each other. Let the chickens out in the yard, or free range, and they are fine.
Humans are natural born predators; we fish, we hunt and we eat. Living in cities with our artificial grocery stores suppresses those natural predator feelings.
Like chickens going to a feeder, or hogs going to a feed trough, so people go to the local grocery store or fast food place and get their food.