Our Federal Government doesn't need revenue. Taxes serve as a gas pedal or brake for an economy. They drive the need for currency. They stave off inflation and can be used to break up pooled concentrations of wealth that are destructive to a functioning democracy and economy.
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So what's the fuss about marginal income tax rates and "fair share"? Why the chatter about how will the government get money to fund its operations?

First we must decouple the idea that spending and taxing are linked. Taxes are not a financing operation at the federal level. In fact, taxes are destroyed upon receipt. You see, the dollar is nothing more than a tax credit. A unit of measure. Just like a run in a baseball game

All government spending is new money. Every cent. From social security to government contracts. All new money. Accounts are merely debited & credited. Marked up or marked down. Congress issues instructions to the Fed who makes deposits in the Treasuries accounts & spending ensue

Second, wealth inequality destroys a functioning society. You can easily see how the issue began in earnest in the 1970s and went absolutely crazy in the 1980s as government spending withered on the people and deregulation became the norm.