The only reason there is a solvency issue with Social Security and Medicare is because of Republicans.

Also, Democrats may have blocked a specific piece of legislation they felt was bad but they did not insist "there was no problem at all."

Here's an excerpt by Barney Frank (whom you name checked above) about just this issue:

https://www.theatlantic.com/business/archive/2011/12/who-is-really-responsible-for-the-housing-crisis/250482/

"Wallison criticizes me for having said in 2003 that I was for "rolling the dice" on Fannie and Freddie. But his memory for the period between 2004 and 2008 becomes extremely selective to the point of being dishonest. In 2004, the administration of President George W. Bush began a conscious plan of trying to increase levels of homeownership as part of its "Ownership Society," raising affordable housing targets for Fannie and Freddie. I opposed this policy because I thought people could end up with mortgages they could not afford. Wallison also omits Democratic efforts to pass legislation to reduce predatory lending -- this was blocked on direct orders by House Majority Leader Tom DeLay. He also conveniently ignores the fact that my Democratic colleagues and I worked with moderate House Republicans to try to pass legislation to increase regulation of Fannie Mae and Freddie Mac -- this was killed by the Bush administration, which according to Republican Chairman Mike Oxley, "gave us the one-finger salute." Finally, he omits the fact that in 2007 House Democrats passed an even stronger Fannie and Freddie bill which later became law. The legislation allowed Bush Treasury Secretary Henry Paulson to put Fannie Mae and Freddie Mac into conservatorship, arresting behavior that could cause further losses. The law has won widespread praise."