In that instance, Prince Mohammed was receiving guests in his palace in Jeddah when he was approached by a suicide bomber who had successfully bypassed palace security protocols. The assassin was not carrying a weapon or parcel of any kind and he had no explosives strapped to his body. The assassin carried his explosives stuffed into a major body cavity. (No, it wasn’t an ear, a nostril, or his mouth.) 

I don't think this is a good argument against using the back-scatter scanners. There are probably far fewer Muslims that want to 'meet Allah' having just jammed a boomer up their whatchacallit than there are willing to do it otherwise. Knowing that they'll have to put their bomb where the sun never shines in order to blow up a plane will make planes invisible as targets to most bombers ...