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Have you ever come across a moral precept in which causing needless suffering isn't bad/wrong?

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I don't believe so. There might be some strange cults that think pain/suffering is good... but, not that I know of.

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And why do you think BAD is bad (if you see what I mean)?

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I'm not sure I see what you mean... but I think BAD is bad because it decreases happiness or increases suffering. I know that's by definition... I can try to expound if you want me to?