William E. Paul says Christians don't get off the hook just because the state tells them to kill:
One of the most frequent arguments used in an attempt to justify a Christian waging war is that "Evildoers must be stopped in their aggressive efforts to overrun the world." Nearly every generation has had its Alexander, Caesar, Napoleon, Kaiser Wilhelm, Lenin, Hitler, Mussolini or Stalin. Certainly the atrocities perpetrated upon mankind by dictators who have aspired to world rule are to be deplored. Evil-doing of all kinds must be hated by Bible-believing Christians who desire to have the mind of Christ. It is said of Jesus, "Thou hast loved righteousness and hated iniquity" (Hebrews 1:9).
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