Brian Riedl nails it at Reason:
Paradoxically, the faster government debt escalates toward an inevitable debt crisis, the less politicians and voters seem to care. In the 1980s and 1990s, more modest deficits dominated economic policy debates and prompted six major deficit reduction deals that balanced the budget from 1998 through 2001. That era is long gone. In the past eight years, President Donald Trump and then Biden enacted $12 trillion in deficit-expanding legislation even as Social Security and Medicare shortfalls drove baseline deficits higher. When even liberal economists warned politicians that the post-pandemic economy faced a modest degree of rising inflation and interest rates—and that a federal spending spree would pour gasoline on that fire—lawmakers responded by enacting the $2 trillion American Rescue Plan. When inflation and mortgage rates resultantly surged to 9.1 percent and 7.8 percent, respectively, lawmakers brazenly continued the inflationary spending spree.
Why are we no longer responding to soaring debt and its economic consequences? While there are many factors, the three most important are these: 1) We’ve convinced ourselves that deficits do not matter; 2) partisan politics and the collapse of lawmaking have turned deficits into a weapon to be politicized rather than a problem to be solved; and 3) few of us are willing to face the unpopular reality that this issue cannot be resolved without fundamentally reforming Social Security, Medicare, and middle-class taxes.