He has a point, in a way. I am always amazed by the amount of 9/11 footage shown around the world in an off-hand manor. I don't think people should show 9/11 time and time again when talking about what happened then, but something of this kind which commemorates what happened is one of the few times I think it is proper to use it. When sensational documentaries about how Bush is the gay lover of bin Laden use the footage, nobody says a word. When the news says 'it's 9/11, the twin towers were demolished in 9/11. Here's the clip. Right on to the next story' nobody says a word.

'Proper' use is an entirely subjective notion, but I've never quite understood the concept that there are certain parts of factual history to which we should not be subjected.

Well the twin towers' collapse saw the deaths of many people, it's not thought proper to broadcast a beheading, so why broadcast the death of so many?

Oh, I don't know... wasn't that long ago that hanging in the public square was the rule.  Individually identifiable victims being slaughtered, I can see your point.  Even the 9/11 footage has mostly been washed of shots of people leaping to their deaths from 70 stories, though.

Yes.  There is a way to honor the fallen, without exploiting them.