Child abuse,physical or emotional, creates long term negative effects. It is not just about the hit or the unkind words at the time - underneath there is damage to a child's self esteem. It is easy to bully a child. It is even easier to hit them with hands, sticks, canes, pokers, hairbrushes, and other weapons.
If you pull down a child's clothes to expose a bare bottom you add humiliation into the emotional damage you do. Please think about counting to ten before you lash out?
What happens when an abused child grows up is that they are not able to fulfil their potential without counselling or other support. The world loses out because of this. Child abuse can also increase the medical costs to the world because of the need for anti-depressants as one of the consequences of abuse is depression all too often.