Cars are crap because Robin Reliants are crap
In any individual group which align to a more central ideology, you are going to have those that have good skills and those that are idiots. Saying all the failures belong to the central ideology is flawed. It's like saying some random kiddy group that identifies with Anonymous being idiots and getting caught means that the core Anonymous group are all shit hackers as well as other successful offshoots such as Lulsec.
All it takes is for one skill hacker to decide they want to help Daesh and it could change things dramatically.
Also consider successful undetected hacks will not be known about. Maybe they already exist but we are only aware of their obvious failures, partly because of the propaganda machine wanting people to know to deter them from making contact with the evil ones.
As much as we detest security by obscurity, not publishing information about where Daesh is failing would be beneficial. Let them keep making the same mistakes...