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Cake day: July 6th, 2023

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  • Wait, is that true?

    k = killers, i = innocents, p = total population, r = killer ratio

    p = k+i

    r = k/(k+i) = k/p

    If an innocent kills a killer: (+1 killer, -1 innocent) from becoming a killer; -1 killer from killing a killer; -1 innocent net change, so r goes up (bad)

    Now that you’re a killer, any time you kill another killer, it’s just -1 killer. r goes down (because the numerator gets smaller faster than the denominator) (good).

    This means that the first time you kill someone is always bad, but it gets better if you kill more people. You can offset the net cost of the first kill this way; if r <= 0.5, killing two people will do it. So you’re right that if everyone kills one person, the world will be full of killers. But this also suggests that the best course of action is for one person to go around and kill every killer, and then themselves, leaving the world temporarily killer-free!