Bullying is such a hard thing for me to see or hear about. I have seen it all growing up and now as someone working in the schools, I see it almost daily. In the schools and outside of school it can't be tolerated. Children are usually held accountable in the sense of detention ect. I think the most important thing to remember is that when dealing with a bully you need to show love and as a teacher make them think about their actions. As already mentioned for those that bully, they typically have been bullied and most likely don't know what love is.
It makes me sick to think about the victims of bullying. I would first of all make sure my child was safe. I plan on being completely honest with my own children. Let them know that the Lord their God is greater than any bully. I will make sure they understand that sometimes people (the bully, in this case) do things for many reasons most can't understand; that they have problems. I will tell them that they don't know the Lord and that hopefully someday that will change.
Keep open communication with your children, show them that you love them, make them comfortable enough to tell you when issues come up.
I would then share with them scriptures from the bible. (I would be doing this for my children whether they were bullied or not)
Romans 12:19-20
Beloved, never avenge yourselves, but leave it to the wrath of God, for it is written, “Vengeance is mine, I will repay, says the Lord.” To the contrary, “if your enemy is hungry, feed him; if he is thirsty, give him something to drink; for by so doing you will heap burning coals on his head.”
Matthew 5:43-48
“You have heard that it was said, ‘You shall love your neighbor and hate your enemy.’ But I say to you, Love your enemies and pray for those who persecute you, so that you may be sons of your Father who is in heaven. For he makes his sun rise on the evil and on the good, and sends rain on the just and on the unjust. For if you love those who love you, what reward do you have? Do not even the tax collectors do the same? And if you greet only your brothers, what more are you doing than others? Do not even the Gentiles do the same? ..