I would imagine we would agree that one of the ultimate goals if not THE ultimate goal of human life is happiness. That generally comes from living in a society where wealth is equitably distributed not one where the gap between rich and poor is monstrous. The happiest populations in the world are normally adjuged to be in countries where tax rates are amogst the highest in the world and are slanted very much towards enforcing income equality not letting the extremely get richer! The put it bluntly we need cleaners, refuse collecters, nurses, teachers, refuse collectors and others who do relatively menial tasks very much more than we need the entirely parasitic Elon Musks and the Jeff Bezos's of this world. I would therefore tax people with such obscene wealth at 99% once they reached a level of wealth that would leave them comfortably off for the rest of their lives!