How is it stupid? A wild pitch is done while pitching, an error is done while fielding. It makes perfect sense.
Nah it is still stupid. A wild pitch is still basically an error. A ground ball to the pitcher with an overthrow to first is an unearned run but a wild pitch scoring a run isn't. Pretty much unearned runs in general are idiotic. It is an archaic system that messes up the balance of defense vs pitching completely at this point.