Well, not "nobody." But most of the people talking the loudest about government debt and deficits don't have a clue - they are steeped in ill-informed ideology that doesn't match empirical evidence. (Or perhaps they are invested in the public not having a clue because of a self-interested anti-government agenda.)
Paul Krugman offers a New York Times column that is a useful primer on the real and imaginary issues related to federal budget deficits:
In 2011, as in 2010, America was in a technical recovery but continued to suffer from disastrously high unemployment. And through most of 2011, as in 2010, almost all the conversation in Washington was about something else: the allegedly urgent issue of reducing the budget deficit.
This misplaced focus said a lot about our political culture, in particular about how disconnected Congress is from the suffering of ordinary Americans. But it also revealed something else: when people in D.C. talk about deficits and debt, by and large they have no idea what they’re talking about — and the people who talk the most understand the least.
Perhaps most obviously, the economic “experts” on whom much of Congress relies have been repeatedly, utterly wrong about the short-run effects of budget deficits. People who get their economic analysis from the likes of the Heritage Foundation have been waiting ever since President Obama took office for budget deficits to send interest rates soaring. Any day now!
And while they’ve been waiting, those rates have dropped to historical lows. You might think that this would make politicians question their choice of experts — that is, you might think that if you didn’t know anything about our postmodern, fact-free politics.