1 Keynes theory has never been tried, so we don't know if it would work or not. The theory was that we would incur government debt during bad times, and then when times were good we would pay that debt off in it's entirety. We have never paid off debt, but have just continued incurring more and more debt, in good times as well as bad times.

2 So what you're saying is that we are actually trying Keynsian Theory, whether we're calling it that or not.

3 Actually Bill there are times we paid off at least some of the debt and yet debt growth outpaced economic growth. In the end it is human nature to not pay back what one owes if you can get away with it. 
Many Keynsians have complained over the years that we just havn't spent enough to make his theory work. Imagine that.
His theory was the true voodoo economics; this notion that government spending will "prime the pump" and get people spending more money is purest sophistry as it takes money away from the productive and gives it to the politically connected. Even when printing the money to spend it you take money from the productive through inflation. His was always just magical thinking, that you can get something for nohing. He vonfused money with wealth.