Browsing around the 9/11 videos you get the feeling some of the people commenting aren't very good at thinking.
Here are some of the better ones:
O.O! Maybe they used the DEW:
What other reasons could there be?
The CIA needed a budget boost... right...
This was debated on a video which featured a CGI military plane flying into a building.
Arguing that 9/11 wasn't a CGI animation is just 1 step to far for me. Just give up, go home, don't waste your time, they don't believe what the government tells them as only sheep do that! But they'll happily swallow anything they read on a conspiracy forum, no matter how dumb.
Funny how that works.