Punishment gives the child someone to blame for their feelings of anger and frustration.
Parents will learn that punishment does not teach accountability but rather, it teaches kids that their parents are accountable for the kid's behavior. Parents will learn that most of all, punishment denies a child the right to experience the real consequences of their actions. As a matter of fact, punishment most often causes a child to say very negative and unproductive things to themselves. The punishment for poor performance is poor performance. The reward for good performance is good performance.