“The theory” is that there is a level of debt under which a government crumbles under the weight of its interest payments. This is somewhere above where we are now and somewhere much less than infinity. I have no idea what that number is. Maybe we don’t get there in my lifetime, or maybe people and governments stop buying US bonds.
Maybe we can just artificially increase the denominator exponential growth by inflating it away when and if that happens. I don’t think that will be very popular.
I personally find it annoying that because the GOP started crying wolf long before I was born, we can’t just acknowledge that math exists.
I think the larger problem is that logic exists and the debt hysterics keep trying to wish away logic. This is because government debt is nothing like personal debt.
If you would like to explain why you think the US government, the representative of the US people, will crumble under the weight of debt that is overwhelmingly owed to the US people I’m open to hearing it. Are we somehow bankrupting ourselves? If you loaned your wife a kabillion dollars is your household collapsing under the strain of interest payments one half of your household is paying to the other?
It is true that there is some level of (EXTERNALLY) held debt that would cause problems for the US. What we do know though is that all predictions as to the US being even remotely close to that have been wildly, almost comically wrong.
It wasn’t even difficult to tell these predictions were wrong at the time - it was obvious and plenty of people pointed out why it was obvious. Debt hysteria is primarily the result of people clinging to economic models they can’t admit are wrong.