The training camp at Salman Pak, Iraq was used to train terrorists on how to hijack airliners.
If he doesn't accept either of those facts as a smoking gun, nothing you can say will convince him.
I can take him behind the Green Door and show him the intel, after which I would go to prison for 10 years, and he still would not believe.
"I can take him behind the Green Door and show him the intel, after which I would go to prison for 10 years, and he still would not believe."
Unfortunately it sounds as if his friend has allready taken the blue pill.