Ask HN: Opinions on How Serious of a Problem the National Debt Is?

I know modern monetary theory, we can'd default on debt denominated in money we can print, etc. is fairly popular right now. So I'm curious what the average HN opinion is on it. I personally think that the US debt is an enormous source of potential fragility. But I get the feeling that a lot of people don't or more likely that opinion is starting to bifurcate. What do you think?