"But who de-regulated the market?"
It wasn't deregulation that cause the sub-prime disaster. It was the Feds leaning on banks to give unqualified people home loans ... a form of over-regulation that went the other way. The banks went along with this plan because these mortgages were subsequently sold to Fannie Mae and Freddie Mac ... quasi governmental institutions which absorbed the risk.
These mortgages were then bundled and sold again as very safe investments ... because in the past, Americans would do ANYTHING to keep their homes. But when you have a loan you aren't qualified for and you have very little paid in terms of principla, you can just walk away any time you like. Too many people did this in the past couple of years and the investments built on those mortgages folded like a house of cards and took the economy with it.
Now, I have a great idea, let's put these same people in charge of healthcare!