How do you explain that 99.99% of people are super happy living their lives with just enough money to have somewhere to live and pay for food and some vehicle?

Further, how do you explain that, for most of human history, we haven't lived in economic systems that reward greed in the way Capitalism does? Saying human beings are neurologically wired to behave in an especially greedy way, under Capitalism, is just recency bias.

Is that urge extent in people? Sure, but so are kindness, generosity, and plenty of other traits that run counter to greed and selfishness. To say that the negative ones incentivized by the economic system we live in are somehow more natural than those others, is nonsense.