Strawman,
Why aren't we hearing about more insurance companies going belly up (AIG aside)? Did these risky mortgages require PMI? If not, what were the banks doing to try and protect themselves? I'm just guessing, but I would think that they would want some type of coverage to offset potential losses.
Also, would you happen to know what the purpose of deregulation was to begin with? Political favortism? Trying to increase competition? Maybe something else.