[golergka]

You are correct, this is call for proof.

It seems that in your worldview, one either believes the author, or calls him a liar. But in real life, the third option is actually more optimal in majority of cases. This third option is doubt.

[throw_this_away]

By definition, if you doubt someone's story, then you don't believe them. It's fairly simple, but if you would prefer to pretend that you didn't say what you said, that's certainly your right.