Why is it rare for a bully to sincere apologize?

They rarely ever apologize and if they do is because either the victim gave them an ass whopping or they got caught just like a real case of a female bully saying sorry after someone committed suicide and she was about to get sentenced in court.

Apologizing after they had to beat you up or they got in trouble at the principal's office or in court doesn't count isn't sincere by then. Why is it rare for a bully to sincerely apologize?

Why is it rare for a bully to sincere apologize?
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