I'll give mine to get the ball rolling.
There was a user that, before getting banned, declared that every single living human being alive on Earth right now should not exist because no one had the benefit of a pre-conception device on hand to somehow determine each individual's consent to exist before they started to exist.
I don't know if that take would make David Benatar blush, make David Benatar cackle with glee, or if that was posted by David Benatar himself.
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Yeah like Geo-engineering is not inherently bad (or good). But it was such an impractical plan. Especially when California could sustain itself with by taking back all the water rights from certain farms, recycling and desalinating (which would be a huge project but not as huge as pipeline thousands of miles long that goes through the rocky mountains).