Sin lies only in hurting other people unnecessarily. All other "sins" are invented nonsense. (Hurting yourself is not sinful - just stupid).Robert A. Heinlein, Time Enough for Love, 1973
The guy on the mountain doesn't do it "unnecessarily", he does it for a reason, his own perverse pleasure. Heinlein never did get around to answering that little paradox. So, now tell me again, why is it morally wrong for this fellow to fulfill his prime directive?
So is choosing to be stupid a sin? There's no finding an ultimate earthly source of moral approval/opprobrium to duck behind.