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Objectively speaking, the choice should be simple. He has the chance to save millions of lives, and the only price he had to pay was his own freedom. It's a choice he's mulled over countless times sleepless nights, and yet...
An old high school lesson comes to mind, something about a runaway trolley and five unsuspecting workers caught directly in its path, and the only way to save them was to hit a switch. The catch was that by hitting said switch, you would, with certainty, doom the single person standing on the other track. At the time, he'd answered "Hit the switch" without a shadow of a doubt, five lives finding more value in his heart than one. But when faced with the question in the flesh, when he is suddenly the single person, he finds his confidence draining away, and it leaves him with a roiling stomach.
Morality is all very subjective, of course, but if you were faced with such a question, would you be able to make a guiltless decision?