This is apart of the branch known as Psychology. The idea is that children who learn to be agressive at an early age usually learns that pattern of behavior because of modeling and reward. This means their aggression has most of the time led to them getting their way. Most often we see this attitude among little kids but sadly even more among adults who have never grew out of the trait.
Kids are more likely to copy others of they think that person is being rewarded for their attitude or performance. This can be found at home among siblings or even in the schoolhouse.
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