First of all, thanks.
One of the fundamental differences between the two organizations is that membership in Al Qaeda is voluntary and chosen by people who's individual ideology matches that of Al Qaeda, so expressing dissent that radical would disqualify them from membership. US citizenship, on the other hand, is mostly something you’re born into, and nothing you say can revoke it.
I don't see our leader as trying to quash dissent in any way that's outside the normal operation of his job. He’s a politician, as a politician he’s
supposed to convince people of his point of view. In doing so, he’s supposed to speak up for his point of view.
The truth is that expressing dissent can and does embolden the enemy and demoralize our own troops. The question isn’t if this is true or not, but how we should modify our behavior based upon this information.
Should we make dissent illegal? Of course not, and nobody is suggesting we should.
Should we, as individuals, be more personally aware of the effects of our speech? Yes, and in doing so we don’t harm our individual freedoms, and we leave the decisions on what is and is not acceptable to the individual, just like we did before Bush made this statement and just as in appropriate in a free and democratic society.