I tend to be someone who refrains from bestowing titles on people unless they deserve it.  As far as I am concerned, having a PhD does not rise to the level of being referred to as Dr. so and so. For Corsi the title he has earned is Crackpot.  I suggest that we use this title in front of his name when referring to him in the future.  Hopefully it will stick.
PhD is the acronym for Piled higher and Deeper...
So perhaps Corsi thinks if someone in denial about PO wants to buy a book to reinforce their opinions, why shouldn't he be there to sell it to them?
Otherwise, just another extremist hatchet man for hire I think.