"Nuking the Cube would normally be considered an Act of War. But all warfare is inherently sinful. Therefore, Nuking the Cube is sinful.
Comments?"
Indeed it is. I'd take on the mantle of chief among sinners, but +John Chrysostomos already claimed that one! :)
Your reply is somewhat of a puzzlement to me ... perhaps we don't quite mean the same thing when we say "sinful". If I thought, for example, that committing adultery with my neighbor's wife was an actual sin (something to be confessed if I did it), I wouldn't be going around recommending that it be done. Similarly, If I thought exploding a nuclear device over Mecca was necessarily an actual sin (something to be confessed if I did it) I wouldn't recommed it in my tagline. So what gives? I would hope that we agree that actual sin is something that, by the Grace of God, we would seek avoid, to remove from our lives, even if we are the chief among sinners.
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PS: Don't worry about the adultery bit ... no question in my mind that's a major league sin.