I agree with much of what is being said about the dangers of militant Islam. However, their success and survival has actually been aided by some of those seeming silly rules. For example using the left hand for bathroom purposes and the right hand for eating, which is often from a communal pot or tray, reduces the spread of a number of serious bowel centric diseases like cholera, disentary, etc. Arising in the desert with limited water for washing made that even more important, and ensured the survival of Mohammed’s armies.