[Ianto finds himself in the difficult position of agreeing without judging her for it. God knows the stupid things he's done because of who he's sleeping with. He nearly let Lisa destroy the world and more often than not he fails to call Jack out on his more morally questionable decisions.]
Maybe. But I did the same thing once. I let people get killed because I couldn't see how dangerous someone k cared about had become. I'm in no position to say what she should have done.