It’s greed at the upper levels. People in the lower classes develop hospitality and compassion skills as a matter of survival. Transients routinely share cigarettes and liquor when they have it. Those in the middle class can learn if they’re actively taught to share.

It’s in the upper middle to upper classes that develop greed as a survival habit, and at the tippy top, multi-millionaires and billionaires are willing to shank each other (or arrange their paramilitaries to do it) if it means they can acquire their rivals’ assets. There’s a story about Andrew Carnegie realizing that J. P. Morgan was totally that kind of murderous monster sometime after selling Morgan his steel company in 1901.

There are multiple examples of mutualist societies that take care of each other and don’t resent their meek and disabled. And in our history, they commonly thrive until imperialists and colonizers seize their territories by force.