Whether judgment is rendered perverse by being usurped?

Objections

Objection 1 : It would seem that judgment is not rendered perverse by being usurped. For justice is rectitude in matters of action. Now truth is not impaired, no matter who tells it, but it may suffer from the person who ought to accept it. Therefore again justice loses nothing, no matter who declares what is just, and this is what is meant by judgment.
Objection 2 : Further, it belongs to judgment to punish sins. Now it is related to the praise of some that they punished sins without having authority over those whom they punished; such as Moses in slaying the Egyptian (Ex. 2:12), and Phinees the son of Eleazar in slaying Zambri the son of Salu (Num. 25:7-14), and "it was reputed to him unto justice" (Ps. 105:31). Therefore usurpation of judgment pertains not to injustice.
Objection 3 : Further, spiritual power is distinct from temporal. Now prelates having spiritual power sometimes interfere in matters concerning the secular power. Therefore usurped judgment is not unlawful.
Objection 4 : Further, even as the judge requires authority in order to judge aright, so also does he need justice and knowledge, as shown above (Article [1], ad 1,3; Article [2]). But a judgment is not described as unjust, if he who judges lacks the habit of justice or the knowledge of the law. Neither therefore is it always unjust to judge by usurpation, i.e. without authority.