By this logic someone who kills a person and lets them decay in a swamp such that billions or trillions of microbes benefit, we should hail them as a paragon of charity. I hope this point of view doesn't catch on.
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The reason nobody actually does this, is that EA is a belief system adopted by (at least) comfortably well-off Silicon Valley people to make themselves feel better about their effect on society. If there is a 0.00001% chance they can prevent AI MegaHitler, everything they do to make more money is justified.