no.
they quantitatively eased to reduce the deflationary and systemic harms of the financial market crash.
the cause of the crash was the securitisation and mischaracterisation of sub-prime lending by banks, together with the sale of related derivatives, which were driven by the demands of continuous profitability which the market imposes and which gave them a reason to sell mortgages to people with poor credit histories and then lever them.
the scam worked when real estate was going up.