I think it is very harmful because what are people going to think about the school. He was very childish when he did that. My mom would have been mad if i did that to her computer at the clinic she works at. The principal would be mad if we did that to any of the computers at the school  and then give us detention oh wait yah detention. I would never do that it is to risky and to harmful some people really care about that stuff and some people don't even care about the stuff they brake and some people pay for it.