The ultimate argument for the truth of a belief may well be whether that belief can be the basis for a way of life. If it can be lived, then it is on a very fundamental level, true.
If it ends up killing you, well, you were going to die anyway. We may ask how many others you took out with you when you went, and how much suffering happened along the way, but those are just minor details if you are in possession of the truth.
How much stock are we to place in the anonymous speech of someone on an internet forum, as against the visible and public actions of someone out in the real world? We can infer what someone believe by their actions. We cannot infer how someone will act based on what they claim to believe.
Talk is cheap. Sometimes it has no value at all. (he said).