Look, it works like this. Behe maintains that his "theory" is testable and falsifiable. He says that what would test it would be if you managed to evolve a flagellum in two years by providing immobile bacteria with a selective pressure for motion.
So the question is, if he believes that this would test his "theory", why doesn't he do so?
The answer is that of course it would not test his "theory".
He ducks out of this by asking why other people don't test his "theory" by doing this experiment.
The answer is that of course it would not test his "theory", and that no-one else is going around pretending that it would.
To summarize his argument:
"My theory that pigs have wings would be falsified if someone could spend two years standing on one leg and whistling the Star-Spangled Banner. So if I'm wrong, why don't my opponents prove me wrong by devoting two years to unipedal whistling?"
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