I wouldn't necessarily term all smacking as physical violence. That's going right for the extreme end of the spectrum. I've seen plenty of parents use language that is just plain sadistic and far more cruel than a slight slap to the bottom as it were.

I'm just saying both can be done right. One should not be demonised over the other, when clearly both can have lasting negative impacts on a child. Look at Moonlight for example, the mother never once smacks her child in that.