The media narrative is that unless there is a smoking gun of these terrorists being given written orders by some operative in ISIS or al qaeda, that it’s not really terrorism. They are driven by their muslim ideology to hate and kill non-muslims (or muslims of a different sect) but our western media, police and politicians twist themselves into knots to deny the obvious. The problem is not ISIS or al qaeda. The problem is islam.
I would claim that those written orders are the Koran itself, and prosecute accordingly.