Analogy does not mean equivalence, however, and among the important notions that the word “analogy” conveys is that two things can be comparable on the basis of an underlying proportionality. For instance, two extreme events like the Jewish Holocaust and the Rwandan genocide, though very different in countless important ways, still might be said to share the underlying similarity of intent and even to a certain extent scale (though not the technology of killing or its method). Analogy and metaphor are also constitutive of our cognitive processes: without them there is no possibility of producing theory, no production of thought. The question is not whether analogy should be allowed, but what constitutes a good analogy as opposed to a bad one: to what extent does an analogy work.