It's a good point, but I could equally argue that they don't hurt someone because there actually afraid of getting caught/punished for it. Which yes that is a form of rationalisation, albeit selfish.
Getting caught is a non issue, if someone really wants to they will do. Choosing not to purely out of a sense of empathy/fairness is not for personal reasons.
Take a serial killer for example, they've killed so many that another death wouldn't result in a significantly larger punishment and they've already committed enough murders to know how to get away with it or leave a massive trail for someone to follow. If they choose not to kill a baby because they feel its unfair to end its life at such an early stage that isn't for a feeling of self better'ness.
How about in films where someone refuses to produce the finishing blow in a sword/gun fight or whatever because the person is unarmed? Again, acting against personal beliefs out of a sense of reasoning.
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