It is proven that buillies are only builles cause they get aboused at their home for no reason.For exmpale.A bully's parents migh beat him up or yell at him/her for absoulte o reason and if they keep doing that usally.Then the kid wants to take his/her "anger on someone else and thus just bully someone smaller then them for no reason.Or cause they just wanna show off.

Don't know if that was usefull but still it might give yo some sort of idea