So if someone gives you a cheap loan and you blow it on blow and hookers, that's the lenders fault?
The perfect amount of lending is the amount where the demand for money at a given interest rate meets the borrowers ability to pay it back. There are too many details to get into the minutiae of risk and markets.
I'm not sure which ECON 101 course you took that told you spending = bad, savings = good. It very much depends on the circumstances. The circumstances now are very different than the circumstances that got us into this mess.
As I said before, the Fed certainly has made mistakes. No one is arguing against that. When an institution makes mistakes, do you destroy the whole institution or try to learn from the mistakes? Also, lower interest rates can cause problems, just as higher interest rates can. Anyone who thinks there is one monetary policy that is best in every economic condition is a simpleton.