Downvoted for dismissing a question that is tremendously important to Eliezer's own work without giving any evidence; and for claiming certainty.

It would be reasonable to say that you think it might not be possible. It isn't reasonable to claim to know that it's impossible.

I have just stated that it isn't reasonable to dismiss without argument as impossible what may be our only chance for survival. I therefore find the immediate surge of downvotes surprising, and would appreciate explanations.