Folks in Greece are being taught Keynesian economics by people who don’t believe in it. It seems that when you strangle your economy, budget deficits rise.
Greece’s shrinking economy is leading to larger deficits (less growth means lower taxes and more transfer payments for things like unemployment insurance) and a rise in its debt to GDP ratio (when GDP falls, the debt to GDP ratio rises).
While the Greek experience should be a warning against going down the austerity path in the United States, due to the incompetence of the U.S. media it will be taken as a further warning of the need to act on the budget deficit quickly.
This is sort of like pointing to the medical problems of a person suffering from anorexia as evidence of the urgent need to lose weight. That makes no sense, unless you are involved in the national debate over economic policy.