Ah... ET again...
Someone may believe or disbelieve in ET because they've been convinced by an argument or for emotional reasons, but the mere fact that ET exists or doesn't exist doesn't CAUSE belief or disbelief....
I don't want to believe my mounts PE error. Unfortunately, I do believe it,
and I DO want to believe that I can see Appolo landers on the moon,
but, unfortunately, I don't believe I see them.
