The thing to understand is that there is a feedback loop between social structures and the way people behave within a particular society. Capitalism creates pressures that select for particular types of behaviours. Then people who become successful under this system ensure that it continues working in their favor.
The mistake is to extrapolate that behaviours people exhibit within the capitalist system are intrinsic to human nature. It's akin to assuming that juggling is a natural elephant behaviour based on seeing a juggling elephant in a circus.
This is an excellent essay on the subject incidentally https://www.jamesherod.info/Getting_Free.pdf