As a 22 year-old JW, I spanked my step-son. I thought it was right... well, actually I naturally prefer using my voice... and I'm not talking about shouting as that should be left for when it's really needed to attract attention. I stern voice, yes, although it depends on the situation; I know the best telling-off I ever had as a kid was when a teacher looked at me very sadly and said "How disappointing" in a mild voice.
But my ex hated me being stern. So we explained nicely why we were going to hit him. Or rather, me.
Sick sick sick sick sick. I really must apologise to him someday, it really wasn't necessary, for all that I'm talking only maybe a dozen instance of over the knee and six hard spanks. But he was a tiny child. Sick sick sick sick; one of the few things I wish undone.
I wasn't even smacked as a kid. I got my leg slapped a few times for being smart, and my dad tried to punch me in the stomuch when I was rude to mum one time, but that was it.
It is NICE to be black-and-white about things. Intentionally attacking someone, unless you are attacking someone who is attacking you, is bad. We can dress it up pretty so it will pass in polite company, but it is bad. If you have to resort to beating a child then the problem is in the relationship you have with the child, not with the child.
And by beating I mean any clinically administered punishment after the fact on reflection. I fully endorse the meritious effects of a good hard slap when it is justified. Run for the road, grab the hand, whack the behind, verbal reinforcement, that's fine and natural. "If you do that again I will" is only any good when you do. "Because you did this I am now going to physically assault you." is a different kettle of fish. Not to my taste.
I have never so much as slapped either of my daughters. I am not the parent they live with, unfortunately, but they learnt so early on if I say x I mean x and not y, they don't even try unless they know they have an argument I'll find reasonable, 'cause hey, Dad's fallible too, but don't take the piss, eh? Full credit to my ex for a hell of a lot of why they are such polite young people, but she still seeks confrontation when discussion works far better. And obviously just because I'm discussing it does not mean it is a democracy, but the I say x means x thing comes in handy there. Also when they're little you can convince them anything is reasonable; the fun bit is when they call you on it.