I guess you could make that argument if you liked twisting words and ignoring how the government works. "Leaving it in the taxpayer's pocket" is not what would happen if you defunded NASA. The money would simply go elsewhere.

You seem to be speaking from the vantage of ideology rather than an actual, rational view of reality. Cutting taxes is yet another action (i.e. change from the status quo, like defunding NASA) that you'll need to argue in favor of and outline a plan for. It won't just magically happen even if you cut some budget item.