Yeah, and if the possibility-raiser is a human who would have provided evidence if they had any, then raising possibilities without evidence is Bayesian evidence in the other direction :-)

I think "try to prove" was an importantly different word choice from "prove" in cousin_it's comment. The point is that in the context of a "new age" movement, it may be enough to raise the possibility; people really may not be thinking about it. In the context of Less Wrong, that is not usually enough; people are often already thinking about evidence for and against.