What did Bush do or propose to do to stop the crisis in mtg lending???? If he let the indiscriminate lending go on while doing nothing, and blaming the prior administration and congress for laws he didn't agree with, he IS to blame for not stopping it, even if he didn't start it. Just like Trump is to be blamed for not stopping the spread of covid once it was here, even if it started in China. Once it was here, he was in charge of it, and has failed.
Bush should have proposed something, anything, other than an "ownership" society that seemingly promoted home ownership at ANY cost while protecting shady investment schemes with promises of taxpayer "insurance" for banks.. And it was NOT government lending programs that made the loans without documentation, but when those millions of loans- made by banks and investment firms that saw guaranteed profit safe from losses- went bad, the whole sector suffered. They couldn't let the big banks go when they had been such good donors over the years. The radical right has no problem with 'socializing' corporate loss, as long as private individuals living on minimal income get nothing.