The punishment is not enough
Punishment teaches children the right to use it. Just like Xiao Yi in Class Two, when I keep him in detention, he will confront me and think that detention is for me. I am using the teacher's power-detention. He won't be detained for chatting in class and not attending class. Cause and effect do not correspond.
The educational methods in the book
In the book, there are two ways to solve the problem of children who have done something wrong. The first is to impose a punitive consequence, such as copying, detention and extra homework. The other is recommended in the book, which regards the situation as a "teachable moment" and an opportunity to educate or solve problems together. Respond to "you shouldn't do bad behavior, I want to do this to you." But "now that things have gone wrong, what can we do?"