What do poor people have to do with the National debt? 40+% of taxpayers pay nothing because their income is too low to pay taxes.
What's wrong with skewing the tax system, like our progressive tax system does, toward those who can most afford to pay taxes?
A flat tax punishes the poor and benefits the rich, is that what you want?
That depends on the details.
We currently have a government and election system that is thoroughly in the pockets of big money. If we completely scrap the income tax system and replace it with another revenue-generating process, who do you think will get the biggest favors?