I apologize that my earlier post was so unclear. I rewrote/retyped it and then didn't correct it.
I have studied this all my life but I am no where near the authority of some here. I was a child who was not expected, not supposed to survive.
Some may want to read Sanford's book, Strong At the Broken Places. Her research shows that those who were hit as children do not grow up to hit their own children.
My question is, where do people learn that hitting children is okay or even, good?
What you experienced no child should have to go through but the unfortunate reality is some do, my wife was physically abuse up until third grade when it was notice by school authorities who put a stop to the physical abuse. The mental and emotional abuse continued up to adulthood. Your personal experience left an indelible impression on you that appears to color your ability to differentiate spanking from harm. This is not a condemnation of you, it's fairly normal for those in your position to see this as black and white with no room for the grey making it nearly impossible to answer your question.
I wish there was some way to show you that all spanking isn't bad and I wish that there was some way that spanking wasn't necessary with some children but it is one tool that, used appropriately, works for many (see Wake's example).
Hopefully one way to convey the difference is, I and my brothers were spanked as a children when we did something very bad (when we deserved it), we also knew our parents loved us and the punishment was for our actions. We feared punishment, not our parents.
It is my most sincere wish that you and those who have experienced what you have find the healing and answers you seek and that you may one day shed the anger and pain. I found that forgiving those who have wronged me (whether they know it or not) frees me from my hurt and anger allowing me to move on. Don't know if that would help you or not, simply offering it as an alternate option.