Violence of all kinds is natural to human beings.
No. It signifies an out of balance world view.
No this is not the natural way to express feelings . We have many words in our language which can do the same thing.
It's learned from the parents, what would you expect from a kid that gets smacked. And for those kids that are not smacked by their parents and they hit, they probably learned that from their friends who have parents that smack them.
For some, hitting shows that they resent that person.<br />
On others, when your hitting on somebody, they want to show affection.
among others yes ...