Everyone should have to pay taxes, but let's say your paycheck is only $100. Should you have to pay the same percent as someone whose check is $100,000? Losing 15% means a whole lot more to that person than the person making $100,000. Some would say that an equal tax across the board is fair, but that's not truly fair. Fairness is putting all of the factors into consideration. That person taking in a $100 check should have to pay taxes, but not as much as the rich, that's all.
I'd even say that many Democrats don't even agree with that. They may even like some elements of Trump's new tax plan. There are levels to Democratic economics. Maybe I'll speak differently when I'm raking in millions, but dear lord, who really needs that much money? I'll tell you who, poor people!