Capitalism literally encourages human greed to accumulate wealth and destroy the societal system. Even if you tax and regulate them that's still what's encouraged, as its literally the entire point of the system

And regarding "only some species share resources.." Yes. Us. That's literally what society is. How do you think humans grew to become the most successful species on earth? If you win I do not lose. It's not a zero-sum game. Cooperation is literally a win-win. Do you think technology and science would thrive and prosper in a cutthroat society where people kill and steal from each other over any tiny advantage they can get?