I voted "No".
Regardless of the warnings received from Extremists and Homeland Security, a terrorist attack of the scale of 9/11 would act in the same way 9/11 proper did. People would rally.
I do not think even Michael Weiner, Limbaugh, nor any other 'Bamaer Bashers would live through the public repercussions of openly criticizing the Gov't at such a time.
Terrorism is a tool that can be utilized by both "good" and "bad". Terrorism is magic with many masters.