To further expound on Aidan's salient point -

AP, as he mentioned, is not the sharpest knife in the drawer. So, when it came time to discipline a kid, he did what was taught to him to be done, even though he doesn't fully understand it. It's another good reason to just not have anybody do it, ever. If I'm smart and know how to spank my kid or whatever etc., am I guaranteed that my kid is also smart enough to not hurt his own kids? No. All I'm guaranteed is that it's the first thing he'll try. Conversely, if I just send him to time out, and that's the lesson he learns for his future kids - nobody gets hurt.