If you made investment decisions thinking 10, 15, 20 trillion etc… were unsustainable and that a collapse/debt spiral would occur, it wouldn’t have worked out well for you. I agree that it is unsustainable over a long enough time period.
But just like the gold bugs who have been shouting that the usd is about to collapse for decades now, so buy as much gold as you can, you’d be wrong.
Knowing the direction is one thing, but in investing the timing is equally as important
What’s that quote, the market can stay irrational longer than you can stay solvent?