To most politicians and bureaucrats, the economy is a pie for the tax collectors and special interests to slice up and gorge themselves on. Then they are shocked when the economy stops growing. In truth, people respond to policy changes in ways Washington can't anticipate. When capital formation and value creation is taxed, there is less of it. Unlocking that capital by reducing taxes on income and investments is a sure path to economic growth.
Liberals say tax cuts only help the rich.
But by definition, the rich are the ones with the financial means to invest and create jobs. If it's economic growth and restored prosperity that we're after, no plan that punishes the rich disproportionately is going to succeed. The static attitude of Washington spills over into all areas of fiscal policy. At the same time, the doctrine hasn't restrained spending. Thus taxes can never go down so long as static analysis prevails.