To teach troubled kids that there are better ways to vent your anger than taking it out on other people.
To teach bullied kids that you are not a wimp, there is nothing wrong with you even if you have gay parents or gap teeth.
To teach every single person in this world that we are all precious human beings, every single one of us.
Bullying should not be glorified because it "teaches kids how to survive in a hard world", and being a "tattletale" should not be shunned.
And the Golden Rule; never treat others the way you don't want to be treated.