=== Their very Holy Book directs them to this.
Did I not mention that Mohammed was a Christian heretic who -- like most cafeteria Christians these days -- not only picked and chose what tenets of the faith he found to his liking but also managed to rationalize the condemning and slaughter of others in God's name?
People who live in glass houses shouldn't throw stones.
If you wish to condemn Mohammedanism, I got your six.
If you wish to pretend that a literal reading of the Old Testament -- as so often encouraged by various Christian heretics over the last 2000 centuries -- wouldn't likewise lead to certain excesses of injustice, you're just being a hypocrite of the first order.
Hearkening again to LOGIC, a nation that gilds with Scripture the slaughtering of artificially manufactured unborn human lives for "humanitarian" purpose and who rationalizes legal abortion and abortifacient birth control as "Women's Rights" (and a critical facet of the imposing of "democracy" worldwide if our actions to date are any indication) probably is not well-positioned to make the case for Just War on the moral grounds that another has taken God's name in vain to the point of inflicting violence on innocents and therefore itself must be destroyed.
Probably not a good idea to impose on others a logic you yourself cannot withstand.
Christians follow higher rule than the Old Testament. In case you do not know it is the New Testament. That is why it is called NEW. Old Testament was given by God at the time when the eye for eye and stoning of perverts represented a huge progress. New Testament raised the moral standard to bring love for the enemies and repentence to the sinners.
Islam went backward.