Causes of the 2007 financial crisis

Go here to read a quick summary of some of the causes of the financial crisis.  Many of the systemic issues have not been eliminated.  Instead, global politics, and particularly American politics, have acted to shore up the existence of the these factor.  Unregulated shadow banking is even more dangerous today than in 2007-2008 (see here).  So why don't we regulate dangerous economic activities?