Well in order to panic (privately or publicly), you would have to of believed danger was around the corner and we know from the public comments of economists like Bernanke and economists at the OECD at that time, that they had no idea the biggest financial crises of our life time was eminent. That being said, I've come to the opinion -- and I think there is sufficient empirical research to back up this view -- that the primary driver of the 2008 crises was an unsustainable rise in private debt (in particular household debt), therefore the Fed (in conjunction with the government) should've done something (anything) to slow down this run-a-way growth. Specifically the government could've reviewed and tightened up lending standards and/or forced banks to increase their capital requirements to soften the blow of inevitable defaults. With respect to the Fed, they could've raised interest rates in the run up the crises to help slow down rapid private loan growth.
Of course none of this was considered by the Fed or the government because the economists with the most influence at these institutions apparently don't believe things like private debt play a signficant role (if any) in the economy. This is why IMO, economists deserve a significant amount of blame for the 2008 GFC.