Humans have evolved to be social cooperative creatures not greedy selfish hoarders, and it is only in the last few thousand years, a blip in human history, that these systems developed by, and that only reward, greed and selfishness, have been around.
Don't let these systems and the people who benefit from them (and those who have been propagandised to believe they benefit from it but really don't) fool you in to thinking any of this is natural.