Probably because the CAIR guy rightly realized that many people, like manedwolf, hold all Muslims responsible for terrorism. So whatever the video maker intended, there are folks who will watch it and say "Ah, just like them muslims to do this stuff! they's all responsible!"
Well, actually, I hadn't. I thought extremists were extremists, but most Muslims were just peaceful sorts who maybe need to speak up a little more in denouncing the extremists, lest the wildfire keep spreading.
But you've cleared it up for me! Obviously I was wrong, and as the CAIR representative said, Muslims are people who wave AKs around and attack things.
Thanks for making that clearer!