I disagree. Lots of kids need a good ass whooping from my experience. I've seen kids that call their mom or dad an asshole or a bitch or cuss them out in another manner. I've known kids that steal from their parents. Kids that get smacked for misbehaving don't do that shit.
Should go without saying but i'm not advocating beating children, i'm ok with smacking disrespectful shits though. Not punching, not kicking, not hitting with another object, not anything hard enough to bruise or welt, just a good old fashioned open palm slap.
you probably went down the wrong path when you're figuring out what the best way to hit a kid without leaving a mark is