So just how concerned should we be about America's $28 trillion debt?

America has a problem. Well, almost 28,000,000,000,000 problems.

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US National Debt Passes $28 Trillion, +$4.7 Trillion in 13 Months. General Treasury Account Down by $480 Billion in 2 Months, $620 Billion to Go

So just how concerned should we be about America's $28 trillion debt?