In my opinion, opportunistic children develop from being deprived of praise not by being given praise. A child who is raised with positive reinforcement (reward) over negative reinforcement (punishment) will function better within the school system, will have a more loving view of the world, and be less inclined to be a "punisher" or a bully himself. When the bond between a parent and child is close, it takes only a look to modify behavior. A look from my father could floor me and was all he needed to change my behavior. Why? because I wanted to please him and my mother. It was all based on my love for them and their love for me. That bond is created from birth to three. That's why it's critical to establish that relationship in the very beginning. If you punish a child, especially with physical punishment, a teacher in the classroom is left with no resources to modify behavior. Interestingly, Native American children, I was once told, do not respond to individual praise because the culture is based on doing what is good for the whole. A consultant in an inner city school once told me that when I praised a Native American child, he didn't respond because I had exalted him above his peers and he wasn't comfortable in that role. Being taught by people who understand the culture of the child with whom they interact is critical. And understanding, by the parent, of the teacher's culture and his or her approach to behavior modification is important as well.