No one here who was spanked as a kid has claimed they only survived by the skin of their teeth. That's great that you have no emotional scars from any spankings you received. Spanking is physical violence, whether people choose to acknowledge it or not. You learned fear, as did I or anyone who was spanked. You learned you would be physically touched in a negative and painful way if you didn't do as you were told or did something you shouldn't have done. And it's not just physical pain, it's also humiliating for a child.
Yes, fear sure can be a great motivator, but it's not a very good teacher, and it has nothing to do with respect at all. Respect is earned, not demanded, and not threatened. One can feign what appears to an unenlightened adult as 'respect,' which is really obedience obtained through coersion and fear. A lot of parents don't care how they obtain compliance and obedience, certainly not in the generation when I was a kid. Parents were fairly clueless back then and did not have much guidance into other ways of dealing with an errant child. Their parents probably spanked them. It's a cycle that repeats (hey, just like abuse repeats).
No, just because Jodi is a murderer today does not mean she should have been hit, beaten, spanked or anything else violent when she was a child. Hitting doesn't cure BPD or other personality disorders, which she surely had way back then. She has no excuse for murdering Travis, but violence solves nothing and doesn't change a disordered person into a mentally healthy person.