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The aggressor: psychological characteristics and family environment
Although the school bully does not have to suffer any mental illness or severe personality disorder, usually presents some kind of psychopathology. Fundamentally, lack of empathy and presents some kind of cognitive distortion.
Lack of empathy explains their inability to empathize with the bullied and being insensitive to the suffering of this.
The presence of cognitive distortions have to do with the fact that their interpretation of reality often evade the facts and evidence usually involves a delegation of responsibilities to other people. So, normally responsible for their actions harassing the victim, which would have disturbed or challenged previously, which does not reflect any remorse about his behavior (the data indicate that approximately 70% of bullies respond to this profile).
Current Psychology, on the other hand, school bullies identifies the probable existence of a permissive upbringing that may have been well enough not internalize the reality principle: one's rights must be harmonized with those of others. The result is difficulty putting yourself in the other by a lack of altruism linked to an ego that grows at the expense of others, mere instruments in his service, and has a very low threshold for frustration. Some authors call this type of child as a child tyrant.
The Brat in the family probably play at school acquired habits. Neither respect nor empathize with teachers or peers. His frustrations may lead him to choose a scapegoat. Will often be that partner to make patents its limitations and shortcomings, or simply seems vulnerable.