I know plenty of people who were not beaten or spanked that are responsible citizens today. I also know many who were, and they now beat their own kids. Gosh what a lovely heritage huh?
Defending the beating of children is about as moral as defending a man who beats his wife.
I've seen the results of lack of discipline in action, so DO NOT try to tell me that SOME children don't need the extra "attention-getter" of physical chastisement.
You don't want to use corporal punishment---fine, but keep your nose out of how other people choose to discipline their children.