Go back and re-read "Ascent of Man."
There is no human achievement since the dawn of humanity that didn't bring with it someone else who decided it would be easier to take it than have to achieve it for themselves. And so we have much of our history.
Capitalism is just one consequence in a specific category of a much larger set of principles of human behavior. A consequence, not a primary. Most people spend their lives thinking about the trees, not the forest.