Yup, I have a sister-in-law who thought like you do. She used "time-outs" and verbal disciplinary methods only. Her kids are undiscplined little terrors today, and headed down the path to juvenile delinquency.
Another sister-in-law administered "hand-to-butt" chastisement as needed. HER children are great, polite, intelligent kids, who get great grades in school.
There is a distinction between discipline and punishment. It seems your sister-in-law doesn't know what it is.
If this thread holds true there will be not one post asking a non-beater how well their methods worked and what techniques they used.
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.