correlation != causation seems applicable here. Thing is, I *know* some actual living breathing children. Some of them are *good kids*, they simply don't do "bad" things. They are confident, articulate, engaging and agreeable. Those kids *never* get "spanked". And then there are the others. The aggressive, confrontational, disagreeable, little monsters. They get beat whooped regularly. Now, the children that are likely to grow up without problems... gee, which would you figure that would be, the ones that drove a loving parent to hit them, or the ones that were amenable to reason? Gee, lemme think...

There's literally no way to successfully run this experiment without being able to clone test tube babies.