◾Glass-Steagall legislation, which kept Wall Street and Main Street banks walled off from each other, was repealed in 1998. This allowed FDIC-insured banks, whose deposits were guaranteed by the government, to engage in highly risky business. It also allowed the banks to bulk up, becoming bigger, more complex and unwieldy.
You can thank senator Phil Gramm (republican from Texas) he slipped an amendment into a bill that eliminated the last vestiges of the Glass-Steagall Act . And got that through a republican congress.
Some who wants to blame needs to put the blame where it belongs.