In 1913, at its introduction, the highest marginal federal income tax rate was 6%. It was an astonishing and unbelievable 91% during the Second World War. A century ago, it applied to under 4% of the total population. Today, almost every worker has to pay the tax mafia.
Add in the state taxes, property tax, and sales taxes, and many middle class people are paying over 50% of their total income to various levels of government. A capital gains tax on unrealized gains will absolutely be used to crush these people. The ultra rich will shield their wealth. The doctors, professors, small business owners, and the like will suffer. Since they don't have any real gains, they will be forced to sell their assets to pay the insanely high tax bills. The elites will gladly buy their properties and investments for a discount.
Oh, and Cernovich has the correct response for filthy commie trash: