Spanking has always been a controversial method of punishment. During any physical punishment, the parent tries to associate pain with the wrongdoings of the child. This is not healthy for either the parent or the child. Even if the intention is to keep the child from breaking rules, the child associates the pain with the parent giving the punishment. Oftentimes, this teaches the child to fear the parent. Also, when parents use pain as a punishment, it is very common for the parent to spank or hit their children when that child makes them angry by doing something wrong. When that happens, the lines between discipline and abuse become blurred.
I invite Pro to address the question: "How far is too far?"