These terrorists are simply inhumane. Why they feel that using young girls for such evil purposes is aligned with their religion, is beyond me. They need to be wiped out. Simple as that.
It's because religion allows them to do that. Keep in mind that religion is like an out of control book club where everyone has some idea as to what it is and constantly has to come back to the source to see what is says or to take what it says for their own interpretation. It's enough to where there are more who agree with a fringe idea than the rest of the book club is comfortable with and it just takes at least
one of those fanatics to do something that will draw more attention to that fringe idea.
So if some abnormal thought process that is outside of what we know is true, is enough to give someone the ability to use young girls for certain purposes, then that's all the leverage they need to do it, whether they believe it or not. I never tire of coming back to the Paris attacks to make the point that, while Muslims don't agree that people should be killed for drawing the prophet, they don't disagree with their belief that it's wrong. I heard the interpretation of this, recently be that to represent any prophet in any form is blasphemous because it's just like creating a false idol. Who came up with that crap? Someone who wanted to establish some made up principle out of the air to get their way somehow.
In this little "book club" I'm referring to, people need to constantly remind others that:
1. you can draw Salinger whenever you want,
2. he was just a fiction writer, not a prophet and
3. The characters in the story are made up.