I do not personally possess the knowledge with which to evaluate this person's claims or belief. Therefore, I have to index on other information to evaluate the plausibility of the claims.
In this case, the other information is 1) proven credentials in the subject matter and 2) general acceptance of his theories by a community with more credentials. He lacks the former and the latter, so I'm disinclined to give his theories much attention.
Plenty of so-called outsiders have made amazing discoveries before, or at least hypothesized what would eventually be an amazing discovery. Maybe that's the case here. Yet skepticism seems warranted without that being considered an ad hominem attack.
In this case, the other information is 1) proven credentials in the subject matter and 2) general acceptance of his theories by a community with more credentials. He lacks the former and the latter, so I'm disinclined to give his theories much attention.
Plenty of so-called outsiders have made amazing discoveries before, or at least hypothesized what would eventually be an amazing discovery. Maybe that's the case here. Yet skepticism seems warranted without that being considered an ad hominem attack.