So your saying the federal reserve manipulation of rates caused the current crisis. It had nothing with banks and credit default swaps.
There are many reasons for the current crisis but the primary one is probably the Federal Reserve, which left interest rates too low, igniting a boom in housing. It also flooded the system with cash to bail out Long Term Capital Management and for Y2K, which contributed to the run up of the Tech Bubble.
However, lax regulation also contributed significantly, and the banks put a gun to their head in the belief that markets are always efficient. Markets are not always efficient. They took on too much debt under the assumptions of how asset markets behaved most of the time. However, when asset markets started behaving differently than their models suggested, they wound up too exposed and are now dead.
The US banking system is effectively insolvent. Had banks accurately assessed risk, this would not have happened.