Because it is less cruel than many other methods of killing animals. Halal slaughtering and kosher slaughtering are actually much more humane than hitting the animals in the head with a stud gun, or stringing pigs up by their hind feet while they are still alive. read more
There is an element of “cruelty” in all killing of living animals for food for us humans. Banning halal slaughter is short sighted. A ban may be challenged all the way to the US Supreme Court on the grounds that it contradicts the Constitution regarding freedom of worship. read more
It doesn't in the UK because KFC are selling halal chicken. read more