If I believe that an action, e.g. killing-someone-from-a-distance-for-personal

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If I believe that an action, e.g. killing-someone-from-a-distance-for-personal-pleasure-in-the-act-of-killing, with no extenuating circumstances, is always wrong, must I also believe that not-having-that-action-done-to-me is my "right"? Or can "rights" only exist in the presence of an enforcing authority, while wrongs can exist with or without an authority? Under what circumstances could an act committed by a person be judged morally as a "bad" rather than a "wrong"? I apologise if this reads like an academic question, but it comes from a conversation I had tonight with my wife. Thank you.