I would even go further and say that sometimes one sees a poorly behaved or chutzpadig child, and one can see immediately that there is no organic cause, but a simple lack of parental discipline. I think a lot of kids are being pumped up with medicines for all kinds of behavioral issues when often simple old-fashioned stern discipline is all that is needed.
I am not a heartless person, nor do I deny that clearly some kids do have a clear organic problem which requires special help. But Hashem created the midah of anger for a reason, and that is to raise our kids. One obviously balances it with much love, laughter, jokes and family trips, etc. A child needs a balance of positive and negative reinforcement, and a happy home life.