I think it's a harmful joke because his making someones school his. And that school is not even his school to call it that it was his. And he was beeing ethical because that school isn't his.

They hack because they want to know more about you, or they want to hurt you. They can jake you  or other serious injure. Hackers can never be ethical because their stealing.

I think that they should do that to the people for helping them if predators that trying to get all your information.

If they keep a eye on it they can prevent deaths, and other serious things. 

If the people start putting like a password on the information, or a virus to protect themselves from predators.

To never give information with who your chatting with.

If they read there comments they can prevent many things.

If the security in that is monitering we can save lives.