a mere housewife
Not your cup of tea
Doesn't the validity of the analogy come down, at least in part, to what one thinks of the FV? If one thinks the FV doctrine is wrong but not terribly dangerous, then one is more likely to be scandalized by the analogy. If one thinks that the FV doctrine is a soul-killing, church-wrecking error (as I do) then one is more likely to be attracted to the analogy.
Dr. Clark, I think this is true. Yet, if one is seeking to convince people who are not really aware of the evil involved, I would agree with Rich that a very strong analogy (which will necessarily be perceived as overblown by those who are not yet convinced) could stand in the way (perhaps more especially with us laypersons) of helping us to follow the reasoning and see either the exact points one is seeking to illustrate, or the real evil. If what you are seeking to convey is your own level of outrage, they can certainly be employed to that end: if you are speaking to a roomful of those equally outraged, I think they are probably somewhat dangerous (for I always find it somewhat dangerous to speak very strongly with a group people none of whom are disposed to check the rising temperature of the discussion). But they are not in themselves convincing to others of the level of evil involved; and the person who is not convinced of that, rather than seeing the points of contact for which the analogy may be useful, is probably more immediately hung up on all the ways in which the CREC and Iran are not alike.
Another point is that I think one can perhaps get away with more of these colorful and strong, and often very telling, analogies in obvious good humor. My husband had me laughing last night making some further and very telling points of contact with your CREC/Iran analogy. In this case I think what will communicate are the actual points of contact, rather than the burning sense of moral outrage: the usage of 'ultimate evil' is only a sort of prop, which works good humoredly to convey that you do think these people are really bad: but no one is all that hung up on having to compare them too closely and fully, with all the felt horror which unmasked and hideous forms of evil do inspire in us, to the terrorists.
Thank you for such a kind response. Again please take my words as those of a very mere housewife.