@king_saturn: Because no religion tells them to do the things that they do. How is the religion responsible for them being crazy? They interpret it wrong and that is their responsiblity. The religion sjmoym exists, it doesn't make people do anything and can't be responsible for making people do things. They are responsible for their own actions and it isn't the fault of the rekigion. Yes the religion can give then fuel, I agree, but it still isn't their fault. They cannot fuel someone who isn't already crazy.
If a religion has passages in it's religious texts to "Kill Idolaters" how can this not fuel someone who isn't crazy if they are dedicated to the faith they believe in ? Would not said person who follows this passage just be following their GOD's wishes and trying to be obedient to him in spite of the violence the passage says to do ? Now I agree that these ISIS folks are indeed crazy... but their religion's holy texts do have some teachings that could easily lead to violence from a slightly warped interpretation. The religion is at fault as it is the fuel for these humans to do violence through it's teachings even from a warped perspective. Now if these religious texts had no incitement of violence in them at all. You would have a point as there is no basis for these people to kill from the religion itself... but if you read the Quran or the Bible... you can easily see where someone could use the book as fuel for these actions.