I live surrounded by 1.5 million normal Moslems within 50 miles that by American standards, (or any other human standards), are criminally insane. I blame it on Islam of course, as do they.
Your version is the version that is taught as the Moslems establish a forward base, once you are indoctrinated enough and they have enough power base they will go to advanced training in hopes to get you and yours to become their cannon fodder.
Sad, but true as it has been the same pattern for 1400 years.
As for the many leaders that do condemn it, they do not exist here in the heartland of Islam. If one were to dare do so he would be executed in the streets as a collaborator. That is not hidden knowledge, it is openly discussed or even bragged about in the local Arabic newspapers. It is considered that anyone who wants peace is against the Jihad and therefore prejudged of a capitol crime.