To which I respectfully submit this rebuttal: So? It's not Tullius's job to enforce justice. He is not a governor, the leader of the province, or a watchman. He is a General in service to the Empire, and as a result of that role he is a soldier. If his orders entail such behavior, then so be it. His principles dictate that it is not his place to question his oath to the Emperor. The fact that he has moral scruples with his own orders means he's sane, but the fact that he continues to place duty above them means he's sticking to his principles, not abandoning them. There will be time enough to fight the Thalmor later - but under a united Empire, not a fractured collection of rebellious states.