Actually, the debunking sites said 'sources please' whenever Loose Change made a random comment and supplied no relevant information. Because after finding about 300 mistakes and showing counter-answers, well-researched, for each one, I doubt the person is going to go on a wild-goose chase.

By the way, it is an answer. But I'll expound:

Read the links. Also, you might want to notice that the government is not incredibly retarded. You'd think, I don't know, they'd figure out these factors such as a simple plane not being able to take down one of their buildings before doing it, infront of almost every American and on almost every television.