You shouldn't try to encourage your child to be violent.
Paul's son has been getting bullied at school by a student in his class.
Paul wants his son's bully to see consequences for his bullying.
Paul asks the bully's parents and teacher to take action about the bullying.
Paul tells his son that the next time his bully bothers him he should punch the bully in the nose.
The bully is punished for his actions by his parents and teacher and Paul's son is not bothered after that.
Paul's son punches the bully and gets in trouble for it at school.