Dude. This isn't about the revenues. Or GDP growth.
There are several charts on this thread. Look at them until it finally registers. Particularly spend some time on the "Federal receipts/outlays in 2005 U.S. dollars" one I posted again in a comment below.
Note the revenues during the glorious late 90s boom. Note the even higher revenues of 2007, when the unemployment rate was 4.5 percent, the evil Bush tax rates were in play, and the stock market had cracked 14,000. Now look at that red outlay line. Keep staring at it until the penny drops.