Well, one of my formative memories while being a child at school contributes to it, I was once saying some mean thing to another child because of other kids, that child slapped my face back quite good, I don't remember what I was saying, just that it was mean and that the slap made me question "why was I being mean for no reason?", an epiphany which helped me greatly.

On the other side of things, I do remember having suffered some forms of violence from parents and those really did not contribute to anything than showing me why they were bad parents.

> A light slap in the face can be very beneficial for snapping hysterical children out of tantrums

Even “light” physical punishment is not proven beneficial. The research generally does not find a safe beneficial threshold where hitting becomes good if mild enough; it finds that physical punishment may suppress behavior briefly but is associated with worse outcomes over time. “Light” changes the severity, not the evidence.

Where the proof that caning people for mistakes creates in the the desire for vengeance where they will hit their children.

Naughty children won't work, or do vocational training. Have you worked with children?

> A light slap in the face can be very beneficial for snapping hysterical children out of tantrums. This is proven!

Can you share any reference or scientific study affirming this? Extraordinary claims require extraordinary proof.

> hysterical children out of tantrums

In my humble experience, children throwing tantrums are likely experiencing overstimulation or emotional overwhelm, and fixing the causes could eliminate the problem more effectively that slapping the problem out of them.

Beat up their dad