“Your post would make more sense if interest rates on U.S. government bonds were rising dramatically.”
Not sure what you mean. Can you elaborate?
If the level of government debt was really a problem you would see interest rates on U.S. Treasury bills rise dramatically. Rates rise when investors demand a higher return to offset one or both of the following: (1) a higher probability of default when the debt is too high (not a scenario worth considering for U.S. government debt); or (2) a higher probability of government-fueled inflation to reduce the future value of the currency (definitely a scenario that investors would consider).
The low rates on the 30-year bond tells me that the Federal debt is not seen as a problem by investors right now.