Why wouldn't redemption be in the cards? He's hardly like the former monsters I've seen in real life who served time in prison for murders, but turned their lives around either through religion, or some kind of counselling. If they--hardcore killers who once had not a piece of a moral compass can be redeemed, then Lockwood is not too far gone.
As mentioned earlier, with the Lockwood origin set-up, the showrunners cannot drop the ball--when Agent Liberty is confronted by the protagonists--in addressing his tragic experiences and reactions, which cannot be dismissed out of hand, just to wag that finger.