Having worked (albeit volunatarily and a long time ago) with mentally handicapped teenagers (as they used to be called then), I can easily imagine that they would learn to modify their behaviour if they were given a good hard smack, much as an even quite a stupid dog would learn from being hit, not to do things. So I cannot see why it wouldn't work with, say, a young adult with learning difficulties (not autism, probably). So would it be right in that context? Even if it didn't cause them permanent damage? And if not, why is it OK for little kids?
I fully support a ban and feel confident it will be introduced one day. I would dearly love to be able to call the police to report the men and women I see knocking kids to the ground and slapping them around the head on a very regular basis. At the moment the vile things they do are legal, and I think they shouldn't be. People say it won't work, but it DOES work, and the countries where hitting kids is illegal have shown that. Levels of injuries in kids falls. And it sends out a powerful message to society. And if that means that some loving parents are forced to modify their methods of dealing with their children because of it, it doesn't seem such a big sacrifice to me.
I don't see why it is a nanny state to say you can't hit your children and more than it is to say that you have to educate them.