I have a personal "Don't get involved" policy for morally grey areas.
I would not hide the man in my home, but the authorities would get no assistance from me in finding him, even if I knew exactly where he was hiding.
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That being said, if I had been around him for years and years and never seen any negative things, and he truly regrets his actions, I would likely take his side over that of the police. (Ideologically, of course. I still wouldn't hide him in my basement or anything)
It doesn't change the fact that he did what he did in the past, but is he really the same person that he was back then? A man who cries himself to sleep every night and spends his life trying to atone for a crime he know he can never be forgiven for is hardly the young officer barking orders at an oppressed people.
Punishment can come in many forms. In a sense, this man has it worse than any man in prison. His very soul is scarred by his past arrogance and willingness to overlook the depravity of the things he was ordered to do, for whatever reason. No matter what he does, even if the police stop looking for him, he will never be able to sleep at night without seeing the faces of those he had a hand in torturing.
If this crime was recent, or if he wasn't genuinely remorseful, I'd feel completely the opposite about it. In this case though... well, at least he is crying himself to sleep at night while helping the local charities instead of crying himself to sleep at night behind bars.