Of course, as a System Administrator, he had "authorization" to manage the information systems, however, his job was not to damage the systems he managed, mismanage those information systems, or otherwise cause harm to them, so his argument that having access privileges to manage the information systems gives him free reign to cause harm to them, is without merit. If he wins this case, it's not because his assertion that having access and privileges to manage information systems gives him the RIGHT to mismanage and cause harm to them. This is a daft argument that will fail the rules of law, unless the judge is daft.