The term “human nature” is bullshit, there is no 1 human nature.
There are more common natures that humans have, but there are also less common ones - human natures vary - potentially a lot.
What does exist are a variety of not necessarily harmonious behaviours that, according to game theory, will work successfully in certain situations. Selfish behaviours that come at the expense of others/competition, which you can get away with - they work, and they will win out more than those that don’t, so they will become more common as a result. But even altruistic behaviours that come at the expense of the self can later result in cooperation more to your benefit than those who are more selfishly competitive - there is no human nature, just trends varied in type and commonality.
As such there will always be some who thrive under a more capitalist distribution of wealth, and others who wilt due to it - and vice versa to a more cooperative economy with less mandatory inbuilt competition. Interestingly, they both wilt/thrive in a compromise under a mixed economy - where nobody fully wins (hence the impossible job of the politician that necessitates lies, failure and conman talk), and the unending oscillation between two sides of some averaged out centre). A compromise in economy breeds mediocrity, which we currently offset in favour of those who thrive under competitive conditions in the usual Western economic structure. Others think it’s offset in the other direction, but this is more reflective of perception than fact.
I don’t thrive under this structure. I love competition, I really do, just not constant manditory competition for everyone’s means to live - I like to be able to choose when/where/how I compete. To me, this is far from freedom, despite all the many appreciated social freedoms that we all happen to have - making what we have “free” to me but only in this respect. This is why I side with offsetting mediocrity in favour of those who thrive under cooperative conditions - along with a great number of others who really can’t endure the needless suffering of many just so the few can win almost without restraint. I like seeing people win to this extent, but not when it comes at the cost of those who could be granted relief through the same rewards funneled so intensely to so few. We live in a world of finite resources and knowledge, even if it is expanding all the time.
People like me just happen to be outnumbered, and the reasons why, I have explained above.