The key being KNOWINGLY.
When the KKK terrorize someone here or abroad and we know about it we go after them hard. We spend significant time and money trying to monitor these people.
Germany is the same.
Afghanistan is not the same.
If Germany did not know, I'll buy that - But if these folks are involved I expect to see smoking ruins and dead bodies.
And, of course, Afghanistan (TALIBAN) knows about Bin-Ladin and supports him.