An unbalanced look into the matter IMO.
For example, how many wanna be Jihaddies have blown themselves to bits during construction of such devices?
How many have failed to work or work improperly?
Add in the mix of Iraq as Arsenal and to get a clear picture is difficult indeed to paint in the dots.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus