JuankiMan said:
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Yes and no. They do fight, kill and torture to survive but they don't do it consciously anymore and are definitely not repentant in the least. They're so proud that they have convinced themselves that they're doing all that because they want to, because they are in their right to do so and they find it endlessly enjoyable and amusing.
In your allegory, it would be like a guy who claimed he was slaughtering calf not because he was hungry, but because he wanted to feel the flesh tearing before his teeth, savor the smell of freshly spilled blood and taste it running down his throat. I don't know about you, but I'd call the nearest asylum
A quick question, but you've never played Vampire before, have you? Or Mage? Or, to get a little fringy, Demon?
Really… like half the game lines that White Wolf put out, would work here. My point is, that just because the player is playing a sadistic, bloodthirsty monster, doesn't mean they can't work with the rest of the group somehow. Some games work entirely around the concept of you playing one of those.