Some great arguments on both sides. LOL at your comment Rhubard 'I AM right. But I just don't know what I'm right about yet'.
I don't think it's fair to say that parents like bloss smack because they can't think of any options - smacking is one of many options they use. I don't think you can make a good analogy between a care worker smacking a vulnerable adult with a parent giving a considered smack to their own child.
I do take the point raised by Aloha and scummymummy though - we don't know really how our grown up children will view us if we smack them. Do we want to take that risk? I do think the risk is there. But I don't think you can isolate smacking as the only discipline method or parenting decision that could leave scars. Children grow up resenting their parents for all sorts of reasons, from ignoring bullying to making them wear unfashionable shoes to school. My mum smacked me and it was water off a duck's back. But she also used to dig around inside my handbag when I was a teenager and I now have a horror of anyone doing the same.
I respect the fact that for some people all smacking and hitting is bad in whatever context. As others have said, if you feel it's bad you shouldn't do it. But IMO that doesn't make it a bad for everyone.
I have talked to my oldest son quite a lot about discipline. I smacked him occasionally and he said he dreaded being grounded or having a treat taken away much more - smacking was the easy option. But then, I do know at times a smack caught his instant attention, brought an immediate stop to something he was doing, when no other discipline worked as fast - and occasionally IME simple speed is the most important thing.
Talking to my son about discpline, I discovered we were at odds. What I assume works for him is not what he says works for him. I might fondly think that the shock of his normally laid back mummy slapping him would leave a deep impression. But no it apparently didn't. So one victory for PC mummydom. Slapping was not effective. And one victory for the slappers. Slapping did not leave him traumatised.
I also thought the behaviour book at school, the careful punishment and rewared systems his teacher and I put into place helped modify his behaviour. Not really, he says. The single most powerful thing was the threat of being sat with the infants. In PC mummy mode I find this humiliation distastful and old fashioned, but according to my son it worked and he didn't deeply resent it because it only happened after he had pushed the limits and other tactics had failed to stop him.
Sorry I am rambling, I am trying to say that IME my perception of how a punishment works can be extremely far removed from how my son sees it working.
In any pro and con debate on forms of discipline, I am going to bear this in mind - and sit on the fence mostly, I have now decided. I think it is futile for me alone to talk about the rights and wrongs of disciplining my children. It is only one side of the story. And I have no intention of letting my son post his views on this thread.