Wish we could still say this...
This is a British guy in India (in the 1800s), but I think it applies just as well to say, Afganistan or Iraq today.
Ahem, General Sir Charles James Napier-
"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."