"Lets use suffering to reinforce a point! It's totally not barbaric and doesn't strain relationships between kids and their parents!"
I've been spanked as a kid and I don't hate my parents. If anything I love my parents a hell of a lot more than most teenagers do. Yelling at a child isn't going to teach them anything. Humans respond to results, such as burning your hand on fire, that's how we learned, "HOLY stuff FIRE BURNS!".
Plus it's not like a little pat to the ass isn't going to forget anyone up. I'm pretty sure I came out just fine.