In Why the ETH supporters probably have it right... and wrong I used an analogy - that we would appear to advanced aliens as ants appear to us - that ruffled a few feathers amongst some nuts-and-bolts types, who pointed out that at least a few humans do indeed study ants - entomologists.
But for them I have the following question:
How many entomologists spend 60 years - or longer, if you are a proponent of the notion that ET has been coming here for centuries - studying the exact same ant hill?
That idea strikes me as ridiculous. It's a desperate attempt to force fit our own way of thinking onto potential life forms that would be far more advanced than we are - and they would have to be much more advanced in order to get here from there (ignore someone like Stan Friedman, who will try to tell you about how it's actually relatively easy to get to our local galactic neigbours, if only we would try harder).
Again, I'm not saying that the ETH isn't a good hypothesis... indeed, as I noted before, I think it's the most plausible one amongst the various paranormal hypotheses on offer. It's the claim by nuts-and-bolts ufologists like Friedman and Keyhoe - and hucksters like Billy Meier - that ET is making his way here aboard flyings saucers and acting like we do that I take issue with, because, despite the misleading title of Friedman's new book, that contention is far more science fiction than science fact.
Ufologists like Friedman and Keyhoe who try to convince you that aliens are basically just like us are no different from religious fundamentalists who portray God as a kindly, white-haired anglo saxon. Such portrayals tell you a great deal about the people who put those images and beliefs forward, but absolutely nothing about the possible entity or entities under discussion.
They are flying saucer fundamentalists, and in their own way they have done as much damage to the serious scientific study of the UFO phenomenon as people like Dr. Edward Condon, Dr. Donald Menzel, or Philip J. Klass.