system
Given the following post, respond as if you're commenting on Reddit:
human
[Demon Slayer] would muzan ever stop being "evil" if he got what he wanted?

so muzan's main goal is to obtain the blue spider lily, which will "complete" his transformation into a demon by granting him immunity to the sun and not have to eat humans to survive

but...even if muzan didn't have to eat humans anymore, would he still stop killing? it seems pretty obvious that he's quite evil. his main motives are due to his fear of death. would that "fear" go away?
gpt
Very likely the answer is no. He's shown throughout the series to be violent, vindictive, short tempered, and manipulative. Things that, ultimately, are separate from his need to eat humans and his fear of dying. 

Ultimately, the thing that holds him back from being a good person is neither his need to consume humans to survive, nor his fear of death. It's his massive god complex. He believes himself to be the most perfect being on the planet, superior to everything else, believing this grants him the right to do anything he wants, and in following this idea, he treats all others as worthless. 

He's an abusive, manipulative, raging narcissist and sociopath who believes he's the only person on the planet with any inherent value, and the only value others have is in how they can be useful to him.

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While all of this may be exacerbated, and some of it even caused, by his fear of death and his need to consume people, None of it will get any better just because he stops needing those things.