In order to get it passed, The politicians promised that the average forking person would never have to pay even a single thin dime in the new income tax. It was supposedly only going to apply to the very top- most wealthiest (Rockefeller, Carnegie, etc.). Also, tax withholding was implemented as an emergency war- related revenue acceleration trick that we were promised would not outlast WW2. FYI
There is nothing more permanent, than a temporary government measure.
Correct, originlly only the top 0.5% had to pay income tax.