If they’re intentionally tanking markets they have to find a way to blame it on Republicans - or better yet - the vast right wing conspiracy. Just tanking them will have a backlash. Then again maybe they’ll just go after the bankers - well, first the bankers. Then the stock brokers. Then the people who might have “talked down” the market. Lots of scapegoats out there.
With all the demonizing of bankers and "Wall Street", I suspect the vast majority of the (misinformed) public blames them for the crisis.
To date, in the public mind, Obama and his administration remain above it all.
Remember: $2BN to ACORN.