Well it
might be in the best (long-term) interests of humanity to have autonomous flying killer robots powered by OpenAI secret military contracting work cut the human population in half, in the name of the long-term ecological health of the planet, and to cull those not smart or fast enough to run away, thus improving the breeding stock.
That's why I don't trust people who run around claiming to be serving the best interests of humanity - glassy-eyed futurists with all the answers should be approached with caution.