The rare smack on the butt when your four-year-old tries to run into the street is probably not going to damage your kid forever, true. And I know there are parents who justify that kind of thing because “you can’t reason with a four-year-old, and it is incredibly important that they be taught that running into the street is dangerous.”
So, while I would never do it myself, I will concede that there are RARE situations where a SMALL slap isn’t going to be damaging.
Much beyond that, though - yes, it does damage kids forever. Or at least, it damages their relationship with their caregivers, which is pretty much the same thing.
I wasn’t severely abused, in that no one ever burned me with cigarettes or locked me in a closet or starved me or anything like that. But I was hit a lot, with no warning, sometimes with a hickory cane, had objects hurled at me, went to school with broken eyeglasses after a wallop alongside the head, etc. etc.
I resented my mother to her dying day and beyond.
I never once laid a hand on our son and neither did his father. He’s now 23 and has a fantastic, warm relationship with both parents. I wonder why his parental relationships are so different from mine?
(Also, in case it’s a necessary addendum: my son is a productive, contributing member of society. He’s far from perfect but he’s kind, he works hard, and he has stable, caring relationships with others. He’s not a thief, drug addict, spoiled brat, or anything like that.)