A well known, and often committed, logical fallacy is the false dilemma.^[1] When you consider two variables (US Government, Al Qaeda), you have the following, logically possible options:

That's four possibilities, not "either the US did it, or Al Qaeda did it". As you'll note, "neither" and "both" are also options.

What happens when we add Israel, Saudi Arabia and Pakistan?

http://www.timesargus.com/article/20090620/OPINION02/906200304

The truth about 9/11

Published: June 20, 2009

I read with interest the letter from William Rice about 9/11 and the subsequent response from a reader to Rice's observations that discount all the facts that he presented. 9/11 discussions on op-ed pages rarely go well. One writer will offer an observation and then another will claim that observation to be absurd. This was exactly the case last week. No matter what fact you may present that shows the official version of events to be dubious, you will almost certainly be called a conspiracy theorist, or worse. TV personality and Fox News commentator Glenn Beck recently lumped those of us who claim to be part of the 9/11 Truth Movement in the same category as James W. Von Brunn, the man accused of murdering a guard at the Holocaust Museum in Washington, DC. It's a strange leap of logic, but 9/11 discussions rarely elicit logical thinking.