Animal pain, suffering, and death: why does it matter?

[KeysrSoze]

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However, I think there is a big difference between feeling that killing bunnies with butterknives is wrong, as I strongly do, and thinking this behaviour is wrong, which I, frankly, don't.

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I think from an evolutionary view that its the opposite, theres nothing wrong with torture/killing bunnies, but the behavior is wrong. In a communal/gregarious society that behavior would be selected against (who wants to live with someone callous/crazy enough to pointlessly torture an irrelevant living being? A lot of serial killers get their start doing this) and taboos and repulsion is manifested toward these actions.