The dotcom bubble was caused by idiots in charge of their own investments. People who dig ditches, fight fires and do heart surgery may be the best at their respective profession, but that does not qualify them to handle their own money via Scottrade. What happens is people catch on too late to the easy money and put their money in. Others see the easy gains and follow suit. Before long you've got people buying stock based on what the share price is or how much it's increased instead of what the earnings potential is.
It's one of the fundamental problems with our markets and society, imho. Short term solutions to long term problems combined with a lack of discipline has led us to believe anyone can do anything and that cheap is good. The people who invested in every dotcom or IPO were idiots and would have been better off with a balanced portfolio. Instead, there were people taking HELOCs to invest in puppyshow.com.
I can't see how that is Clinton or Bush's fault.
default swaps are a different animal.