Just to comment on the section in bold, if a parent has a temper and is an alcoholic and/or drug addict, a child should also not be physically punished. Do you think they are less likely to be injured or killed? As far as sane men not physically abusing themselves, I can’t remember which Christian resource it was but there was a suggestion to classically condition the eyes to avoid looking at tempting images. A rubber band would be worn on the wrist. Any time your eyes gazed upon female curves, or looked too long at a tempting picture, you would snap the band on the inside of the wrist. Pain is an effective tool for classic conditioning. The problem isn’t the catalyst (pain) to correct a behaviour. The problem is the one who is issuing the discipline. It should be administered by an authoritarian to correct a behaviour, not by a person to force authority. That’s what happens usually. The authority needs to be recognized primarily. If not, that’s when it escalates because it becomes a battle of wills and refusal to submit to another. All discipline is only effective if hierarchy is established and the rules are laid out and understood. Otherwise it is considered an attack conceptually.
Job 31:1
I made a covenant with mine eyes; why then should I think upon a maid?
The covenant I made is to pray for their salvation.