with our insistance on cultural and moral relativism, but I'm reminded of the quote by Sir Charles Napier (refering to the Hindu custom of sati or suttee):

"You say that it is your custom to burn widows. Very well. We also have a custom: when men burn a woman alive, we tie a rope around their necks and we hang them. Build your funeral pyre; beside it, my carpenters will build a gallows. You may follow your custom. And then we will follow ours."