Well, wasn't that the point?
To blame other people and instigate war while simultaneously destroying evidence.
Here's 2 really informational websites,
We Are Change Minnesota and
MN 9/11 Truth > MN 911 Truth Home. They put out a video called 9/11 Mysteries. Part 1 is about the demolition of the towers.
Also, you can search this forum for 9/11, and you will find threads about this topic, and what people on here think about it.