“by the time the AI is smart enough to do that, it will be smart enough not to”
I still don’t quite grasp why this isn’t an adequate answer. If an FAI shares our CEV, it won’t want to simulate zillions of conscious people in order to put them through great torture, and it will figure out how to avoid it. Is it simply that it may take the simulated torture of zillions for the FAI to figure this out? I don’t see any reason to think that we will find this problem very much easier to solve than a massively powerful AI.
I’m also not wholly convinced that the only ethical way to treat simulacra is never to create them, but I need to think about that one further.
But we want them to be sentient. These things are going to be our cultural successors. We want to be able to enjoy their company. We don’t want to pass the torch on to something that isn’t sentient. If we were to build a nonsentient one, assuming such a thing is even possible, one of the first things it would do would be start working on its sentient successor.
In any case, it seems weird to try and imagine such a thing. We are sentient entirely as a result of being powerful optimisers. We would not want to build an AI we couldn’t talk to, and if it can talk to us as we can talk to each other, it’s hard to see what aspect of sentience it could be lacking. At first blush it reads as if you plan to build an AI that’s just like us except it doesn’t have a Cartesian Theatre.