Their issue right now is they're tracking towards 0.44%, not 2% as they intend. Their goal is to increase inflation towards 2%.
> All this money printing will end up in inflation at one point, which is also the only way to ever repay all that debt.
This is a common misconception among armchair economists (and a great point against Bitcoin, too). The issue we're facing right now is that the velocity of money has been reduced, causing deflationary pressure (not inflation). This is typical in recessionary environments, and not at all desirable. Satoshi's will notwithstanding.
Further, as long as the expansion of the broader economy outpaces the growth in deficit it doesn't actually need to be paid back. Also, more than half of US debt is domestically held.