He really does have a point. That's evil. When Congress ratified the 16th Amendment on Feb. 3, 1913, there was a sense in which all private income in the U.S. was nationalized. What was not taxed from then on was a favor granted unto us, and continues to be so.
Where are the limits? There weren't any. There was some discussion about putting a limit on the tax, but it seemed unnecessary. Only 1% of the income earners would end up paying about 1% to the government. Everyone else was initially untouched. Who really cares that the rich have to pay a bit more, right? They can afford it.