Without commenting on this specific case, it's often a lot more difficult and nuanced than simply what is best for that individual child. If you're in a class f

Without commenting on this specific case, it's often a lot more difficult and nuanced than simply what is best for that individual child. If you're in a class full of around 30 children and one child is misbehaving to the extent that they're a danger to others around them, then sure, ideally you'd spend the time with that child and do what's right and best for them, but in reality you also need to think of all the other children in the class and what's right for them and often, the amount of time you'd need to spend with such a child would unreasonably distract you from helping out the other 29 children which simply isn't fair on them. Often, punishment in such cases is simply there to enable the teacher to continue teaching the rest of the class (with the limited resources at their disposal) so that at least the majority can learn and benefit.