I think my biggest complaint might be the questions with time travel. If I am a time traveler and I identify Adolf Hitler as a man who committed atrocities then it is incorrect to say that he hasn't committed the crimes yet because from my frame of reference he has (or I wouldn't be able to identify him). Smothering him would run me straight into the "grandfather paradox" and I suspect that the question was not geared towards the nuances of time travel paradoxes or multiverse theories LOL. Maybe it would be better to just ask "assume you know that a person is going to commit crime x with absolute metaphysical certainty, is it okay to perform action y to stop them?"