Oh, I don't know.

I'd say that taking down WTC was a rather well thought out target, wouldn't you?

It is, after all, or was, rather, the HQ of western imperialism, as far as they were concerned.

The Pentagon, also, a rather well thought out target, given its mission.

While I agree with you that many of the jihadists are probably not very sharp tools, I'm inclined to think the people leading those movements are nobody's fools.