Never commented on the youtube video. Very informative and I think it just further addresses the point that extremism is caused by taking the Qur'an's words and twisting them. There was a piece of information I read somewhere stating that the most dangerous terrorists who say they understand the Qur'an the best, really dont know anything about it due to the fact they never actually studied it. Most picked it up, read sections and didn't look into the history behind certain Surahs.
Again obviously though you make some incredibly valid points and can back it up with examples, which I still have to look at one by one, but I feel that with history, violence can be seen everywhere. For example in the Jewish religion, when we look at Vladamir Jabotinsky and his future aid in creating the Irgun. One of the very first terrorist organizations, aimed at fighting the British.
I'm not sure if you've read Qutb, but if you want to talk about a little bit of crazyness, here ya go. If you have read it then you know the influence he's had over Bin Laden. If you haven't had a chance to read it... it is a good number of pages and can tire the eyes by staring at a screen. I can print it for you and mail it if you'd like.
http://www.globusz.com/ebooks/Milestone/index.htm