"I was both beaten and smacked, and yes you are right they are very diffierent
they are damaging, humiliating and destructive of self-worth in different ways"
In your experience, greensleeves. I was smacked as a child, both with an open hand and a wooden spoon. My self-worth is intact, and I didn't (and don't) feel damaged or humiliated.
I knew I was pushing the boundaries, but obviously I felt that whatever I was doing at the time, that I KNEW was unacceptable, was worth getting a smack for. Let's face it, if I got a smack for the same thing twice, it can't have been that bad, because I wouldn't have done it again!
I don't tend to use smacking with my children (I find counting to 3 effective at the moment, and have found that if they want to do something enough, a smack will be no deterrent anyway), but I don't disagree with it in principle.