I'm sorry but I don't see the connection, though I can see that you're trying to discredit me somehow. I will simply try to repeat myself more clearly, so that you may see the reason in it and not need to resort to non sequitur strawmen (that said, if you are interested in discussing the merits of team sports, you are welcome to create a separate discussion for it).
Psychologically speaking, the goal in any sort of behavior change in adults should be to instill intrinsic motivation, rather than relying on extrinsic motivation; intrinsic motivation is lasting, extrinsic can cease whenever the reward/punishment/whatever ceases and the behavior will lapse. I imagine with children this is even more important as they are even more of an easily manipulated (and I mean this in a generic sense, not the sense with a negative connotation) blank slate. Thus, the goal with parenting should be to provide the child with intrinsic motivation to behave in a pro-social manner; this means there should be a clear, direct connection between the undesired behavior and some consequence that demonstrates the negative aspects of the behavior, so as to help the child to justify the need for behavioral change.
Possible objection: the child is too young to internalize the value. In this case, no method, no matter how scientific or how brutal, can succeed, as the child's brain simply has not developed sufficiently to allow the necessary understanding and capacity for memory (hence attitude) formation. I lack expertise in developmental psychology, so I do not know the specific time-frame for childhood psychological development, but the cause-effect, behavior-consequence relationship can be simplified at younger age and made more complex over time to ensure understanding. Assaulting the child (word choice validated if the child's point of view is considered) teaches her/him nothing but the usefulness of violence in disputes, and this lesson endures to adulthood, continuing the vicious cycle of violence. Impractical from a scientific perspective, absolutely unethical from a human perspective.