Why Did Americans Stop Caring About the National Debt?

Probably because the team who was using it as a boogeyman had to lay out 5.5 trillion in stimulus packages (Cares Act, Consolidated Appropriations act of 2021 both signed into law by DJT).

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“If you owe someone one thousand dollars, you have a problem.<p>If you owe someone a million dollars, _they_ have a problem.”

Lovely, more gaslighting.