[oblio]

Or, alternatively, it's called "taxes" and "wealth redistribution".

High inequalities is proven to be bad for development, so clearly there is a point where people have too much and it's harmful to society.

Ergo it would be immoral to allow some to hoard wealth infinitely, just because they can.

[Whoppertime]

That is begging the question. The question is not "Why are some people poor" that is the default state of humanity, and has been for the past 100,000 years Homo Sapiens have existed. The question is what are the succesful doing right. It is not because of "hoarding wealth infinitely" that a doctor has more money saved up than someone addicted to drugs and living on the street. It is their decisions that lead to their current circumstances. The doctor spending a decade in medical school and residency has delayed a lot of gratification getting their, while the drug addict likely had some issues with impulse control or delayed gratification.