How do you think the wealthy got wealthy without selfishness?
You seem to be implying that it isn't the inequality, but that all those poor people should stop being selfish.
If only those poor people would stop being selfish, the wealth inequality wouldn't be a problem.
LOL.
Most inherit it. Then lose it. That’s the typical path of wealth. Rarely, it’s amassed by someone who starts with little. Here these people, the ones who create rather than squander wealth, are called “selfish” often by the wealth squanderers, the children of abundance.
https://www.thelangelfirm.com/debt-collection-defense-blog/2...
If selfishness isn't a good general explanation for Pareto distributions, is there a reason that it's particularly explanatory for wealth distribution?
You could measure selfishness in small experimental scenarios and try to correlate it with the wealth of the subjects. Does that evidence exist?