The current U.S. National Debt is fast approaching the 20 trillion mark. It's currently $19.977 trillion. While interest rates are low right now, historically they have been in the territory of around 5 percent. From 1969 to 1996 they were above 6 percent. When interest rates go back up to 5 percent, that will mean 28.5 percent of the federal tax revenue will go just to pay the interest on the debt. That's if there is no budget deficit and the U.S. is not paying down the debt. This is a very conservative forecast. There are a lot of potential scenarios that could turn out much worse than that. I don't understand how anyone can say this isn't a big issue we should be concerned about.