From what I understand, it still had a ways to fall and then they tried to stop it. It's not working. The fed keeps lowering interest rates to get people to borrow more money, which is what got us into this problem in the first place. Lowering the interest rates gives a temporary boost, but it can only go so low. Then it will fall even further because people took even more loans they couldn't really afford.
Printing so much money to pay off the national debt will destroy us.
Okay, let's take this one step at a time.
"What got us into this problem in the first place." What got us into this problem in the first place was the collapse of housing prices. This created a panic and lead everyone to be scared of debt. But people are already working on that. Household debt is falling. Business debt is falling and businesses are siting on huge reserves. This creates a problem though because if I try to save and you try to save and everyone else does then suddenly nobody is buying anything and we have a massive recession.
"Lowering the interest rates gives a temporary boost"
There's this little thing called investment. It's when you take money and spend it on something to be used in the future be it a house or business. What lowering interest rates does is make investing (most noticeably investing in houses) more attractive, ramping up demand. This creates a problem if there is too much demand in the economy because then too much demand is chasing too few goods and services and runaway inflation results. But we don't have that situation, we have 9% unemployment. There are tons of people who would work or who would work more hours if there were opportunities for them. So inflation isn't a concern. With inflation not being a concern, investment is a win win. You spend your money sooner (getting a better price because of the slack market and getting attractive loan terms) and the people you pay are employed instead of unemployed. It's true that you wont spend in the future, but now somebody else will spend your money in the future when otherwise they wouldn't have had the money to spend.
"Printing so much money to pay off the national debt will destroy us."
First of all, nobody is really printing money. What the federal reserve is doing is slightly modifying the terms of loans between very large banks, making it more profitable for them to invest then sit on their cash.
Secondly, it's not being done to pay off the national debt.
Thirdly
INFLATION IS BELOW TRENDFourthly it's projected to remain so for an extended period of time, based on what the market spread between inflation indexed and un-indexed securities trade at for a wide variety of assets. The people who believe that the Federal Reserve is somehow destroying our currency have lost huge sums of money trying to put that belief into investment strategies for the past three years.
If you wish to spout libertarianism and insist on talking about monetary policy, then do yourself a favor and read some damn Milton Friedman.