Suppose the following hypothetical society:
Everyone has universal basic income whether they work or not - quite generously so. Nobody is homeless, nobody is poor, everyone gets free high-quality healthcare if needed, everyone gets free (or affordable) high-quality education. If people do choose to work, the wages are good. Nobody is poor. Housing is available to all. The environment is good, the society is safe, crime is low, and it isn’t hard to climb the opportunity ladder.
Now, in such a society, what would be wrong with there being billionaires (or perhaps even trillionaires), as long as they accumulate their wealth the honest way and pay all proper taxes? Suppose that you have 1 percent of people at the top who own 50 percent of all wealth.
It would be unequal, for sure. But would anyone necessarily be being harmed by such inequality?