Even if this is so, there is tons of evidence that humans suck at reasoning about such large numbers. If you want to make an extraordinary claim like the one you made above, then you need to put forth a large amount of evidence to support it. And on such a far-mode topic, the likelihood of your argument being correct decreases exponentially with the number of steps in the inferential chain.
I only skimmed through the video, but assuming that the estimates at 11:36 are what you're referring to, those numbers are both seemingly quite high and entirely unjustified in the presentation. It also overlooks things like the fact that utility doesn't scale linearly in number of lives saved when calculating the benefit per dollar.
Whether or not those numbers are correct, presenting them in their current form seems unlikely to be very productive. Likely either the person you are talking to already agrees, or the 8 lives figure triggers an absurdity heuristic that will demand large amounts of evidence. Heck, I'm already pretty familiar with the arguments, and I still get a small amount of negative affect whenever someone tries to make the "donating to X-risk has expected utility".
I don't think anyone on LW disagrees that reducing xrisk substantially carries an extremely high utility. The points of disagreement are over whether SIAI can non-trivially reduce xrisk, and whether they are the most effective way to do so. At least on this website, this seems like the more productive path of discussion.
It also overlooks things like the fact that utility doesn't scale linearly in number of lives saved when calculating the benefit per dollar.
Woah, woah! What! Since when?
Unless you mean "scope insensitivity"?
8 lives figure triggers an absurdity heuristic that will demand large amounts of evidence.
Well, sure, the absurdity heuristic is terrible.
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