He allows himself this only once.
It is a Wednesday, late, and he is alone in the office — which is the only time he permits himself to think the un-useful thoughts, the ones that serve no professional function but that accumulate behind the useful ones until they need somewhere to go.
He thinks: what if I am wrong?
Not wrong about the identity. He is not wrong about the identity. The case against Gideon Vale is circumstantial and partial-printed and based largely on the intuition of a professional who has spent twenty-six years learning to trust his intuition, but it is not wrong. He knows it the way he knows the shape of his own hands in the dark.
He thinks: what if I am wrong to stop him?
This is the un-useful thought. This is the one he does not permit in meetings or in reports or in conversations with Briggs about the moral architecture of the investigation. This is the one that lives in the back of the board, behind the red string, in the space between what the law says and what he actually believes when he lies awake at three AM and lets himself.
He has been doing this for twenty-six years. He has built cases against people who killed for pleasure, for need, for compulsion, for the specific pathological joy of it. He has never once — not once, in twenty-six years and forty-two cases — felt what he feels about this one.
Which is: the specific, unacceptable, unprofessional feeling that if a different system existed — a better one, a more complete one, one that actually addressed what it claimed to address — the Surgeon of Sin would not exist. Not because the Surgeon is a product of the system's failure in the ordinary psychological sense, but because the targets would not exist. The network of violent, untouchable men that Gideon has been quietly dismantling for two years would not have been left to accumulate.
He knows this thought is not useful. He knows that every vigilante in history has had someone making this same argument in their defense. He knows the defense is structurally necessary and practically corrosive.
He still thinks it. Once. On a Wednesday. Alone.
Then he closes the thought down, the way you close a door in a house that is otherwise entirely organized. And he goes back to work.