Under the assumption that a lesser power is unable to punish injustice done by a greater power, the three possible alternatives at any level of power are “Injustice is dealt with by a greater power”, “Injustice is dealt with by peers”, and “Injustice is dealt with by nobody”. The first system sounds nice, except that infinite regression is impossible, and so eventually you end up at the greatest level of power, choosing between systems two and three. In that case, system two seems preferable, “vigilante” connotations notwithstanding.
Under the assumption that a lesser power is unable to punish injustice done by a greater power, the three possible alternatives at any level of power are “Injustice is dealt with by a greater power”, “Injustice is dealt with by peers”, and “Injustice is dealt with by nobody”. The first system sounds nice, except that infinite regression is impossible, and so eventually you end up at the greatest level of power, choosing between systems two and three. In that case, system two seems preferable, “vigilante” connotations notwithstanding.