 Lastly, recent debate in Switzerland has been contentious, in part, because of comparisons by a prominent activist between kosher slaughter and the methods used by Nazis in concentration camps.The metaphor was borrowed from the vegetarian and Nobel Prize laureate Isaac Bashevis Singer who said "I am not a vegetarian for my own health, but for the health of the chickens" and has one of his fictional characters say, "every day is Treblinka for the animals.