Who is to blame

What I think is odd is that people are not blaming Moody's and S&P that rated these mortgage bonds AAA. You might rate a bond AAA and it is latter shown that is should have been lower but not over a trillion dollars worth. You can't tell me that Moody's and S&P both rated these bonds AAA did not know that maybe they are not as strong as advertised. The governmnet should regualate the ratings on bond so consumers know what they are buying and what risk they are taking.