>>64
We are really talking about whether or not there was one, not whether we could possibly find one.
They have two different answers (1. Unlikely 2. complete uncertainty) and Argumentum ad ignorantiam is not applicable to the first argument.
"to state that there never was such a civilization to be true, is committing a logical fallacy"
I said the evidence for it being there is not there, but it cannot be possibly ruled out ever, like the existence of god in god's mystical god world where we can never inspect.