The evolutionary arguments against the plausible of altruism as a construct in and of itself are probably the greatest existential threat to the effective altruism movement. That is, the implication that it is inherently disingenuine. This juxtaposition of care-harm and sanctity-degradation moral foundations are quite simply a rare mix in the human population based on personal observation and inference.
Those evolutionary arguments seem like not understanding the cognitive-evolutionary boundary. If you go with the "evolution is about survival and reproduction, so besides sex and murder everything else is a hypocrisy", you explain away altruism, but at the same time you explain away almost everything else. The argument seems sane only when it is used selectively.
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