I think you're arguing with a moral relativist. Best to give up.
Well, that's a mindless comment.
It's not a matter of "moral relativism," it's merely a matter of addressing how kids' minds work.
An interesting thing about little ones is that their behavior -- including even tantrums -- is often quite logical, based on their view of the world right then.
The trick lies in figuring out where the kid started out. If you can do that, it's often pretty easy to work the problem out -- no beatings required.
Often times all it takes is having them take a couple of deep breaths, or maybe getting them outside to take a breath of fresh air, or distracting them. Maybe they're just hot or uncomfortable from their clothes -- easily handled.
When all is said and done, the goal is to address your kid's behavior. Very often it's possible -- and preferable -- to do so without spankings or punishment.
HJ wants to impose his one or two ideas on everybody, and label it "proper handling." It's bunkum.