This forum looks like it is a little old, but i have really strong feelings on this! I had very strict parents, and I was spanked a lot until my early teenage years. I started rebelling, and got into a lot of trouble as a young person, had a daughter young, with no husband, and swore Id NEVER spank her. But my about 10 she was out of control. All of the "experts" gave me these different things to try, but they did not work. I started spanking her, and guys things got better. I stopped about 2 years ago not because I decided she was too old, but because she didn't need it anymore.
All of the experts are using theories that grounded in the understanding we have right now about psychology. Most of it will be outdated in 5o years just like what was popular 50 years ago is outdated today. But the one thing that is NOT outdated is the Word of the Lord and it does NOT mix words. Spare the rod, spoil the child. PERIOD. The fact that we are so resistant to that today makes me believe we are straying farther and farther from the moral righteousness of God.