Take two people, one that is poor, only earning the minimum wage, and one that is rich.
The poor person may not be paying any federal or state income taxes...but he does pay a lot of other taxes - sales tax, utility taxes, gas taxes, et al - and these taxes take up a much greater proportion of a that poor person's income than they do of a rich person's income. Of course, one might argue that these are only 'use taxes'...but if you think about it, all taxes are 'use taxes'...and
any rich person uses FAR more of America's taxpayer-funded infrastructure than any poor person.
Adam Smith, the "Father of Capitalism", recognized this when he said:
"The subjects of every state ought to contribute towards the support of the government, as nearly as possible, in proportion to their respective abilities; that is, in proportion to the revenue which they respectively enjoy under the protection of the state."
and
“The necessaries of life occasion the great expense of the poor. They find it difficult to get food, and the greater part of their little revenue is spent in getting it. The luxuries and vanities of life occasion the principal expense of the rich, and a magnificent house embellishes and sets off to the best advantage all the other luxuries and vanities which they possess. A tax upon house-rents, therefore, would in general fall heaviest upon the rich; and in this sort of inequality there would not, perhaps, be anything very unreasonable. It is not very unreasonable that the rich should contribute to the public expense, not only in proportion to their revenue, but something more than in that proportion.”
But in today's political Right, the "Father of Capitalism" would be branded a bleeding-heart liberal socialist.
Be that as it may, conservatives are right about one thing - taxes ARE wealth redistribution. But when the rich pay the extra taxes, do those dollars go up in a puff of smoke? Of course not. When the poor get money - through whatever means, but preferably through work - they SPEND that money...and the money they spend helps to support their local businesses, which supports the local economy, which helps the national economy. HOWEVER, if a rich person decides to send their money to the Caymans or opens factories in China, those dollars are - as far as the American economy goes - WASTED.
That is why it is good for the nation - in morality and in effect - that the rich pay higher progressive taxes.