First: wealth inequality is the result of persistent and pervasive income inequality.

Second: there are frequently individuals with very-highly-fluctuating incomes. Performing or creative individuals in particular -- actors, writers, filmmakers, musicians, athletes -- may have a few good, and many lean years. Taxing their good periods excessively would actually be counterproductive.

Taxing nonproductive wealth -- withheld or idle capital -- would put it to productive use. That's the fundamental principle of a land tax, as advocated by David Ricardo and Henry George. That concept fails to properly account for the withdrawal or degradation of natural capital, often at tremendous rates relative to the financial profit booked, and a case where natural capital is simply an off-books aspect of activities.

Ensuring that all citizens can meet the fundamental needs of life is crucial -- something Adam Smith, David Ricardo, Robert Malthus, Karl Marx, and John Stuart Mill each advocated for. "A man must live by his work" -- Smith.