The old "it was luck that got them their wealth, so it's morally acceptable to rob them" argument.
Not just luck, but the infrastructure that surrounds them and permeates every transaction. Luck alone gets you an extra coconut to take back to your mud hut, not a billion dollars and a super yacht. So yes, it's moral to charge them for that. It is not moral for them to take those services and benefits and not pay for them.
Ah the old "they benefited from living in this country, so the country has a right to rob them" argument. Self-righteous demmaogogues love to propose robbing successful people and spreading their wealth.
Ah, the old "taxes are robbery" argument. Libertarian romantics dreaming of their Randian Utopia, blissfully unaware of how wealth is actually created. Wealthy people are not necessarily successful people, unless your sole measure of a person is how much money they accumulate. Seems like a rather impoverished viewpoint.