Jim, this practice does not arise as a result of ‘basic human nature’. It emanates from a ghastly ancient, backward, misogynistic philosophy that is drummed into its adherents from the day they are born. Whilst, as far as I am aware, neither the Koran nor the hadith directly instruct honour killing as such, the Koran does recommend that women who bring disgrace should be confined to their houses until they die, and in some areas certain perceived 'crimes' are still punishable by stoning the ‘guilty’ and often the not so guilty to death. Mohammed’s view of women was that they are deficient in intelligence and objects of shame, and for some Muslims the only way to find recompense for perceived disgrace brought upon a family is to remove the cause of that shame – in this instance, the women. You are sadly mistaken in assuming that people who carry out these barbaric acts possess a mindset similar to your own, or to that of anyone raised in a western culture. They do not. They are indoctrinated into an appallingly backward philosophy, and every single aspect of their lives is governed by that philosophy – including the perception that women are not only less worthy than men, but they are the property of men to do with as they will. The Koran and its author, Mohammed, are revered by Muslims and considered to be beyond criticism – which is a great pity – because in any civilised society, both leave much to be desired.