Yet if an islamic terrorist was arrested in the US and tried an insanity defense, you'd likely throw a fit.
You can be perfectly sane and perfectly evil. It's just that studies of suicide bombers (most Palestinian, I believe) have found that most generally free of mental problems, have all their faculties, and know exactly what they're doing.
What is idiotic is the cliched portraying of all Islamic terrorists as insane nutjobs.
Bin Laden, Zahawari - I'm sure all these guys are perfectly sane. They're also perfectly evil. To simply dismiss them as nutjobs actually doesn't do full justice to their evil.
IMO, “possessed by an evil spirit” seems more appropriate than “insane” in the case of this a-hole