I take your points but I genuinely would hope Australian parents would be advanced enough to realise smacking is out of date and unnecessary. The article in yesterday's Age really resonated with me about how in the 33 countries where smacking has been made illegal (and my understanding of the convention is that it extends to all forms of corporal punishment) there have been significant reductions in child abuse generally and crime rates. So many posters yesterday were saying it wouldn't make a difference but clearly there is compelling evidence to the contrary.
I think it's great that the College of Physicians will be running an advertising campaign to raise awareness of this issue.
I believe that for every 9 parents who smack "reasonably" (or however it is phrased) there will be 1 that doesn't and that parent may cause significant harm to a child. There are enough cases of children being beaten to death by their parents who believed it was discipline. If a law like this saved those kids lives then I personally believe it's worth it.
I guess I don't understand (and never will) why some parents are so reluctant to challenge their views on smacking (or how they discipline their children generally). I am far from a perfect parent (very, very far) and nor do I believe everything I do is correct, but I am prepared to listen to experts and challenge the way I go about parenting.
ETA I also don't agree with a slippery slope / what next argument. There doesn't seem to have been any problems in countries where smacking is illegal with this - why are we so scared?