Also that killing you outright isn't optimal.
I can't do much about scenarios in which it is optimal to kill humans. We're probably all screwed in such a case. "Kill some humans according to these criteria" is a much smaller target than vast swathes of futures that simply kill us all.
I offer this particular scenario because it seems conceivable that with no possible competition between people, it would be possible to avoid doing interpersonal utility comparison, which could make Mostly Friendly AI (MFAI) easier. I don't think this is likely or even worthy of serious consideration, but it might make some of the discussion questions easier to swallow.
1. Value is fragile. But is Eliezer right in thinking that if we get just one piece wrong the whole endeavor is worthless? (Edit: Thanks to Lukeprog for pointing out that this question completely misrepresents EY's position. Error deliberately preserved for educational purposes.)
2. Is the above scenario better or worse than the destruction of all earth-originating intelligence? (This is the same as question 1.)
3. Are there other values (besides affecting-the-real-world) that you would be willing to trade off?
4. Are there other values that, if we traded them off, might make MFAI much easier?
5. If the answers to 3 and 4 overlap, how do we decide which direction to pursue?