I'm sorry, but I have to say that this sounds suspiciously like creationist logic. "He won't publicly debate me, therefore he has no idea what he's talking about!"
Nope. You're misrepresenting my argument. I
know Fetzer doesn't know what he's talking about with respect to Apollo. Why? Because he's dabbling in my profession that I've practiced successfully for 25 years. His Apollo claims are almost entirely ignorant of the relevant fields. And I'm pretty sure he knows it. My argument is the reverse: "Fetzer has no idea what he's talking about, and that's why he won't publicly debate me."
Fetzer's long-standing m.o. is to wave his academic credentials, which have almost nothing to do with any actual knowledge, and on that basis pretend he knows everything about whatever subject he happens to be discussing that day. Fetzer has no relevant training, education, certification, or professional experience in any of the subjects having to do with his Apollo claims. But he manages to convince his fans that his "philosophy of science" degree covers all that.
It doesn't.
The veracity - or lack thereof - of his claims has nothing to do with whether or not he's willing or able to debate them.
The veracity of his Apollo claims is not a question. He's laughably wrong.
And of course if one's living is made by convincing the public that one is an expert (but really just bluffing), the last thing one wants is to come up against an
actual expert such that people can see one's head get handed to you.
Public debates don't determine who has the stronger position, they determine which party is the more skilled debater.
Well, your problem here is manifold.
First, Fetzer
does debate in public. He is a public figure who makes his living espousing and promulgating controversial claims. The problem is that his debate style is based entirely on intellectual bullying, without subjecting himself to any actual accountability. But Fetzer does recognize the need to debate. So your belief otherwise isn't binding on him.
Second, while there are indeed factors in public debate that produce an uneven playing field, public debate still has value in testing ideas and compelling their proponents to stand by them and defend them. One's sudden unwillingness to debate a controversial claim he has made in public is
de facto suspicious. Further, public "sound-bite" style debates have historically favored fringe claims because it is easy in that format to simply drop innuendo and shift the burden of proof.
Third, Fetzer's reason for declining the invitation ("If he doesn't have a PhD then it's not worth my time") had nothing to do with any of your reasons, nothing to do with any actual expertise, and is a sudden new requirement for challenging his claims. It's a fight-or-flight response: normally he can "fight" with his typical bluff and bluster. But when faced with a situation where bluster probably won't work, he turns tail.
Fetzer's behavior requires us to decide why he avoids meaningful debate of his Apollo claims. You're giving us one set of reasons. But the most plausible reason remains that he knows he's wrong and doesn't want to have his bluff called.