He was a willing participant. He had a choice to stop at any point. How much blood does "I was only obeying orders" rinse from your hands?

[It would be so easy to make the obvious point here. Even in the 22nd century, they still teach the horrors that "only obeying orders" could lead to. But she shouldn't have to go that far for this.]

I can bend the law, but I can't break it. Especially not when he's responsible for spilling that much innocent blood!