Actually, I think the theory is that it would make biological, chemical and radiological agents less likely to be used in a terrorist attack against the US.
Although there is that case of "Islamicists" training on a Boeing 707 parked in Salman Pak from about 1995 to as recently as September 2000. Corroborated by two Iraqi defectors, Sabah Khalifa Khodada Alami and a former intelligence officer who defected in early 2001. Through a translator, Mr. Alami described, according to the Wall street Journal, a daily regimen of exercises on kidnapping, assassination, and -- using a Boeing 707 parked inside the complex -- how to hijack a plane or bus without weapons. He said that a separate group of non-Iraqis were being similarly trained by Saddam's intelligence service, the mukhabarat.
After September 11th, a private US satellite photo company, Space Imaging, went through its archives and found a photo that included a plane parked in the Salman Pak compound.
But I'm sure that's all bogus information and must be dismissed.
From your POV, of course.