I think a lot of it has to do with misconceptions. Children, teens, and even some adults come here with an idea of what they think magic is because of all of the television shows and books out there on the market. They think magic is just a plaything to be used at their leisure for revenge, wealth, power, control, and what have you. All we can do is tell them the facts and try to point them on the right path. What they choose to do from their is their own business. Let them use magic for negative purposes, it will come back to bite them eventually, and they'll learn from their mistakes.
We need to make mistakes to learn and grow as individuals. It just takes some people longer to learn their lesson.