(1) Insisting that those who disagree with you prove their opinions sets too high a bar for them. Being light means surrendering to the truth ASAP.
(2) Raising possibilities is Bayesian evidence, assuming the possibility-raiser is a human, not a random-hypothesis generator.
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.
Here's the new thread for posting quotes, with the usual rules: