clipped from: www.positiveatheism.org   

It is an established maxim and moral that he who makes an assertion without knowing whether it is true or false is guilty of falsehood, and the accidental truth of the assertion does not justify or excuse him.
       -- chiding the editor
             of a Springfield, Illinois, newspaper

As Abraham Lincoln said,

They don't really know whether or not their claim is truthful. So why assert it as truth? Why not simply admit that it's speculation and stop trying to sell on what you don't even know? Why do you expect us to believe what you tell us when you don't really believe it yourselves?