this is so retarded it isn't even wrong
corporal punishment is mandatory for children to grow up correctly; if you avoid doing it, you are privileging your own comfort and desire to "feel like a good person" over your children's need to grow up to be healthy and well-adjusted human beings, which requires that they get their asses switched until they understand the boundaries of human behavior and their obligations within those boundaries, something they are ***programmed*** to attempt to circumvent at least a few times
in addition, by declaring Switch Therapy off the table, you are guaranteed to create little autistic hothouse-flower monsters with busted "discomfort" meters that cause them to begin shrieking at shit that they should simply shrug off
now, if you beat your children ***unfairly*** or without a concrete, legible pattern for which aversion is easily attainable - like niggers do - then yes, they are going to be fucked up by that
but if you make it clear that their discomfort is of their own making and it ends when they shape the fuck up and behave correctly, you'll be surprised how rapidly and consistently that happens when a switch is involved
(this is ancient wisdom, stretching back to ancient times, and the people that told you it was no longer true are fucking lying to you and laughing at you for believing it)