Imagine the current situation in the world, but with the guys trying to blow everything up having ~50% more smarts. Instead of the current situation, where they kinda have to collectively puzzle out basic shit ("then Achmed, you make the red wire touch the red post, and Allah causes the bomb to be angry, insh'allah!"), they had the mental capability that your average American garage handyman had.
Imagine the current situation in the world, but with the guys trying to blow everything up having ~50% more smarts. Instead of the current situation, where they kinda have to collectively puzzle out basic shit ("then Achmed, you make the red wire touch the red post, and Allah causes the bomb to be angry, insh'allah!"), they had the mental capability that your average American garage handyman had.