Originally Posted by Botnst

The history and natural history of humans is the same as for any animal: Breed and colonize or die unto extinction. Humans, apparently unique on Earth, are capable of recording history and projecting destiny, however imperfectly. We also are capable of an array of emotions that is also the broadest among animals, as far as can be deduced at present.

From these imperatives of biology and culture we evolve rules of morality that guide our interpersonal behavior within our family, clan, and tribe. But he have never developed a moral code that scales-up to large populations or geographical areas. The morals and taboos of family, clan, and tribe life simply do not scale effectively and as a result, the different moralities of various tribes and nations usually do not map 1:1 against each other. For example, "our" tribal warrior code, Chivalry, differs somewhat from western country to western country but mapped poorly against Japan's Bushido. We found their behavior at war incomprehensible and savage. They viewed ours as incomprehensible and cowardly. But we won and so, chivalry, encoded in the Geneva Conventions, is the international standard of behavior for warfare.

It is in direct conflict with Islam.

B