Duke, from your list I would say:
1) Bertie for throwing fuel on the fire and making the bubble worse
2) Cowen for trying to prevent a quick and corrective recession
I have to add the ECB up with Bertie for creating all the extra money and low interest rates. My reason is that the bubble is the disease and the recession is the cure. The ECB and Bertie created the bubble and therefore are most to blame.