I was not raised a JW and we were spanked regularly. If whatever we did was bad enough, we'd get spanked with a belt...usually three whacks. I don't remember feeling abused even though I certainly didn't enjoy getting that sort of punishment. I know it bothered my parents quite a bit to do it, but that what they were raised with.
I spanked my kids too, but don't feel I ever went overboard. I do agree that spanking isn't the best way to go, but a person tends to use their own parents and how they handled certain situations as a model.
People who spanked or beat their children at the KH seemed to be doing it to show all the other dubs just how godly they were in training their kids and "not sparing the rod". Beating a child to make brownie points with other self-righteous knuckleheads is disgusting.