I think the point that the link makes that I agree with quite strongly- other people have touched on it here too- is that instant compliance (of the sort that I defy any parent not to have wished for occasionally and the sort that clumsymum is advocating smacking to achieve) is NOT worth any cost.
I have been having an intermittently tough time with my 7 year old twin sons this summer. This is MY fault- I am tired from trying to combine doing a passable dissertation with looking after them- this involves lots of very early morning starts so I can actually get some work done in a quiet environment and I am knackered by early afternoon and they aren't getting enough positive attentioon some days. The flat is a pigsty, we are eating shit and I have been on a shorter fuse over a longer period than they have ever known.
We had a just awful day a couple of weeks ago at the park when I found myself, not unfamiliarly, in a situation where we were doing an activity- trying to shoot basketball hoops- that one boy was enjoying immensely and that the other was finding enormously difficult and frustrating. The frustrated boy was behaving extremely badly- belittling his twins efforts while proclaiming against all the available evidence that he was the best in his class at basketball (er, wtf?), running off with the ball, trying to impose rule changes, growling at gently given and well meant advice, stomping, yelling, displaying v poor gamesmanship and generally doing his level best to ensure that if he couldn't get a ball in the net then no one else should have the opportunity and the whole world should know that he was livid with rage. Tried empathy- it is frustrating when you can't do something, esp sport if you're a boy, I think- and making him take time out to calm down, suggesting a change of activity. Nothing doing and the next thing I knew he had launched himself at his brother after the latter successfully got the ball in the hoop. I lost it. Really screamed at him. Asked if there was something wrong with him because this sort of behaviour was not normal. Frightened myself and both boys. Frustrated son dissolved into real gulping, gutted, my mummy hates me tears and confessed that he thought maybe there was something wrong with him because he really, really did want to win and it seemed so unfair that he couldn't score even one basket when he was really trying hard... Were they both good for the rest of the day? You betcha. So if you want instant compliance I can really recommend emotional abuse in the form of becoming a horrible bitch mother from hell, frankly. But that doesn't make it right. I really will be ashamed of myself for that forever.
I'm not saying people who smack are inflicting similar damage as I did, by the way. Not at all. I think what I did was much worse than smacking. But I do think that "achieves instant compliance" isn't necessarily a good justification for anything, tbh.