Each man has a right to his own property, including his intellectual property. Therefore it is wrong to "hack" if this means breaking into somebody's system without their permission, because it is a violation of the right to property. A copy of 'Atlas Shrugged' could drive this point home I think. But there are great jobs in computer security, in which people can get payed to "break into" systems to smell out the security flaws. This might be a positive way of channeling this individual's skill set.