The lending agencies were controlled by banks. The same banks that were selling the crap mortgage-backed securities. If you did a scrap of checking out what happened, you would know the banks determined the levels of scrutiny lenders were going to use . The rating agencies said the bankers were pulling their strings too.
You are being suckered again. Read something real. We had a televised house investigation showing what was going on. The banks, lending agencies, and rating agencies all confessed. Hence you are absolutely wrong.
Banks weren't selling mortgage backed securities you ignorant dumb fuck.