He has to think through his answer a moment, so there's a long pause before he says anything, brows together to show he's thinking hard. "The people who. Owned me. They had me kill people. Lots of them. To make the world better, they said. I'm the only thing that could do that. Bring the world the freedom it deserves." He shudders a little, visible but not too bad, at the repetition of his handler's words. "But I'm not supposed to do that now. Right?"

He hasn't quite hit the point of being able to put a value judgment on that, to say it was wrong. It was his job, and even if he didn't like it, he can't quite call it "wrong". But he can see the comparison, when Ellie lays it out like that. A person who would have killed Ellie (who he very much does not want to be dead) to make the world better, compared to him who absolutely killed people to supposedly make the world better.