Confused-Shepard wrote...
Honestly? It would end up as another Murtock situation where the sympathizer tries too set her free but gets killed for it. Or he caused the Teltin riot and set Jack free but she unknowingly killed him.
It doesn't always have to end in tragedy for the guy helping.
My vision was this:
The guy is persuaded to work there, by a close friend or an official that appreciates his work, and is assigned to guard the doors outside of the facility. No one lets him in on the things that are going on, behind them. And they don't tell him about the fact that the Illusive Man knew nothing about these experiments. He spends the beginning week following his orders, and not asking questions, unless it involved how someone was going to spend their break.
Eventually, he discovers that the scientist were experimenting on human children, and becomes concerned. He reluctantly accepts what's going on when he is reminded that the experiments were for their benefit, and it all was for the "advancement of the human race." His superiors allow him inside, and he spends the rest of his job making sure things didn't get out of hand.
But instead of tormenting the children, the guy guides the kids to the cafeteria and back, stops fights between the children and the guards -- basically doing his job, without abusing his power. He'd be the only good guard, the only reason most of the kids obeyed as long as they did.
Then the guard finds out that kids were getting killed from the experiments conducted. And that more of them were being brought in for the sole sake of getting killed by the same thing. Once again, he gets concerned, and is told that it was a small price to pay, in order to accomplish the goals they set, for themselves. Around this time, Jack gets brought in, and they assign him to guard the room they placed her in.
Then come the perverted guards, and the gladiator fights.
The guard spends the remainder of his time there talking with Jack, and the other kids, trying to provide whatever comfort he could, while secretly plotting the facility's downfall. In the end, he resigns. But before he leaves, he tells all the children to riot, and overrides the locks on Jack's door. Once he's back at his former posting, he informs the Illusive Man about Teltin, and announces his resignation from the organization. Or he could head to the Citadel, contact Fade, and just dissapear.
Either way, he'd be that one guy who gave all the kids a chance to have a life. He'd never know that they'd all end up getting killed by Jack, but at least his conscience could rest easy, knowing that he did what was right.