Food for thought:
“Wall Street” had a positive stake in the 2008 financial chaos that led to the Great Recession. By convincing everyone that the health of the financial sector was vital for the health of the economy, financial companies now have free reign over public opinion and policy. Their hierarchical centrality becomes a self-fulfilling prophecy.
Probably not why things happened the way things happened, but conspiracy theories always provide perspective on events going forward. Unintended consequences abound.