I remember being in school and things like paddling (corporal punishment) were opt-out, not opt-in. I don’t know any parents that opted their kids out. I was paddled a lot in elementary school and into junior high and spent most days indoors for detention (writing). I think by the time I reached high school, it mostly was not used, but still on the books. I don’t remember anyone getting paddled in high school. Even back then, I thought the culture of spankings (and worse) rather strange. My parents didn’t really believe in spanking, but that was rather unusual. Some of the parents of my friends, though? Sometimes threatened to involve me in the beatings of their children. Never happened, but seemed to be a plausible threat at the time.