Extraordinary Claims Require Extraordinary Evidence

[robvalue]

"Supported reason contrary" sounds just like the argument from ignorance to me.

You don't have to demonstrate a claim is actually false to justify not yet believing it is true. And when the evidence is insufficient, a lack of belief is the logical conclusion.

In the case of an extraordinary claim being made with little or no evidence being produced, that is evidence (not proof) that the person making the claim has no logical reason to believe it themselves either.