I don't have the competence to determine with certitude whether Griffina charlatan and a quackor the medical community is right about this subject. My belief that the latter are correct is rooted in a (rational and non-fallacious) appeal to authority, which is grounded in my respect for the scientific method and the process of peer review. I am virtually (99.9999999%) certain Griffin is wrong. But my belief in that regard is (technically) tentative rather than absolute, based as it is on an appeal to authority. I imagine that everyone else here is in the same boat as me: they disbelief Griffin because of an appeal to authority. Appeals to authority can be strong arguments, but they are at best probabilistic.