Why not? Because they don't seem to support a stance which you do support? I can understand why that would make you not trust them, and I occasionally feel that way about studies, but it doesn't mean they are invalid.
Really? because I have not been tipsy when drinking. And I only have one beer when I drink. If I am an average person in terms of blood volume/liver function, then that would mean that on average one beer will not make you drunk.