Earlier quoted context omitted.
How do you push through a phase with no corrective mechanism allowed on the other side? How do you propose you correct your kids? Corporal punishment is quick and decisive and both parties can move on quickly as opposed to the lifelong mental baggage that weighs down a lot of people in the western world.
What makes you say you can quickly move on? Isn’t it the whole point to create a powerful memory that instills lasting fear and influences all future decisions?
Of course, that only works with parents who don’t resort to slapping their kids’ bottoms like it’s nothing (after a while you become accustomed to it as a kid, it doesn’t scare you anymore), and also parents who genuinely love their kids and who have a close and warm relationship with said kids, that way when the kid sees that he has upset his parents he knows he did something bad even before the slap (and in that way avoiding it altogether).
Trying to only use reason with kids who are 4 or 5 years old won’t work.