Problem is that the economy isn't really picking up and so now the bill is passed on to our children and grandchildren to pick up.
It has often seemed to me that if you truly believe in Keynesianism, the fact that the economy is still in the crapper and has been for nearly a decade now really shouldn't surprise you, because we've really only used the bits of Keynesianism that happen to be convenient to our ruling class. If you don't do what Keynesianism tells you to do, you shouldn't expect the results it promises.
(Again, I'm not really a big believer in either true- or political-Keynes, but still, one is a serious economic theory and the other is a convenient fiction.)
> we've really only used the bits of Keynesianism that happen to be convenient to our ruling class.
where I would remind that it is not just about convenience to ruling class; much of it is about populism (paying out popular social transfers from state coffers, and not collect unpopular taxes) which is rewarded with votes.