Corporal punishment does nothing except brutalise both the person administering it and the person receiving it. As a deterrent it's useless. As retribution, it's ineffective, and as a means of making amends, irrelevant.
Well, I think you would have to admit that, to date, there has never been an executed murderer who has killed again.
"A casual stroll through the lunatic asylum shows that faith does not prove anything." - Friedrich Nietzsche