They are necessary. Bullies are necessary too. The fact everyone is so coddled is a bad sign. Life itself isn't fair, and it never has been. Villians and bullies put people in their place, and create true heros. The second you try and make everything seem like heaven you are just lying to everyone, and covering up the reality of life. A place like heaven will never exist on a place like earth. Earth is too real, and forces those within it to give up, or to thrive and fight at all costs. If there was no evil in the world, then the good within people would mean absolutely nothing. There would be nothing to compare it to, forcing the aspect of good to cease to exist.