Smacking Children
A culture of threat and violence harms children, and parents definition of "light" may vary when justifying an actual crime. Our children should not be political punchbags. The law should never condone "light smacks", but it does need to outlaw violence and foster a culture of non-violence.
Of course light smacks are relatively harmless to the child, but parental light smacks may condition the child that it is quite okay to hit their children. That appears to be the problem, now.