For years now people have been alleging that the Fed via the FOMC and other mechanisms has been propping up the treasury market by buying them directly... an effective strategy to keep interest rates low, which will work really well... until it doesn't.
When the market signals are distorted to such a degree, the damage to the economy is cumulative. It may not cause an impact now, but it will eventually.
This is a lot like the causes of the housing bubble (which were in part due to artificially low interest rates.)
Quantitative easing is economic heroin... it makes things feel great for awhile, but the price to be paid on the downside gets heavier every year.
We should have let the banks fail, and the economy work out the repercussions and get healthy.