What you're saying, if I read you correctly (see note at the bottom) it that you find it unacceptable that something can be valuable simply because we find it worthwhile, without having a reason for why it is so. I don't see it like that. The capacity to reason didn't come along with a guarantee that all ignorance will evaporate instantly under the action of the scientific method. We can't just go by reason, because in many areas of our lives, reason alone doesn't go far.

PS: @calf, I've re-read your message above a few times and I must agree with others elsewhere in this thread that incoherence is afoot. Please review your own comments before sending, from the point of view of a reader who doesn't yet know what you want to say.