That's pretty hard to do when the absolute majority of the sum of taxes is paid by poor people. Even if you taxed the rich at 99%, it would be short by orders of magnitude - and then of course you have to consider https://en.m.wikipedia.org/wiki/Laffer_curve
Also, there's a distinction between people below the poverty line, and young people making little wages in their early jobs. Why shouldn't we tax the rich kid working at McDonald's because their trust fund requires them to work for a decade before they get access to it?