Critically evaluate the so-called too big to fail doctrine

Critically evaluate the so-called too big to fail doctrine

Question:
One of the biggest concerns about too big to fail in the context of financial companies is that implicit government support could lead to greater risk taking by those companies and a greater likelihood that such governmental support will be needed  the moral hazard problem.
Edward F Greene, Knox L McIlwain and Jennifer T Scott A closer look at too big to fail : national and international approaches to addressing the risks of large, interconnected financial institutions (2010) 5(2) CMLJ 117-140
With reference to the above statement, critically evaluate the so-called too big to fail doctrine and the related problem of moral hazard.