No, I think one of the very reasons it is so easy for so many people to dismiss 9/11 is that it was sanitized almost imediately, as if those 3000 people had simply gone out to work that morning and been whisked away by spaceships. Remember, one of the crazy theories of the 9/11 deniers is that the CIA took over the airplane and dumped all the passengers out over the ocean before flying it into the WTC...
I think it's good to see this (although I actually couldn't stand to watch more than a few seconds, personally) and remind people of the horrible reality of the whole thing. Even if common sense won't wake them up, reality might.
Yes, I agree with that, that we have a real problem in that it was immediately and agressively sanitized. AT THE TIME IT HAPPENED, the images may have served some purpose -- still even then the images and video would have been overpowering for many and induced the helpless victim effect. Today? Un-unh. Just morbid gawkin -- what do we all want to be teenie goths? Not me.