Can someone's moral beliefs be stupid?

[The Summoner of Leviathan]

That is something very strange to say. If you have a belief.. and the belief says something, how can there be no logic behind them?

If it says: "Do not kill"

Is there any logic behind it? to ask that question is just stupid in itself.. the logic behind it is that you dont kill, so there is always logic behind it.. as the logic behind a rule is that you dont break it. why dont you kill.. because people die otherwise..

Oh, look, the logic behind the belief that killing is (generally) wrong. You just proved that there's a sensible reason to believe that it's wrong to kill people. Congratulations. Even though it appears to be a total fluke.

Actually, if you look at the socio-historical aspect of the Ten Commandments, there is logical reasons behind them.