"Once we do so, we may very well just apply CEV to them and get the best compromise of our values again. Or we may keep our own values, but still allow them to live separately and do their own thing, because we value their existence."

The problem I have with what you are saying is that these are two different things. And if they are two different things in the case of the aliens, they are two different things in the case of the humans.

The CEV process might well be immoral for everyone concerned, since by definition it is compromising a person's fundamental values. Eliezer agrees this is true in the case of the aliens, but he does not seem to notice that it would also be true in the case of the humans.

In any case, I choose in advance to keep my own values, not to participate in changing my fundamental values. But I am also not going to impose those on anyone else. If you define CEV to mean "the best possible way to keep your values completely intact and still not impose them on anyone else," then I would agree with it, but only because we will be stipulating the desired conclusion.

That does not necessarily mean "living separately". Even now I live with people who, in every noticeable way, have values that are fundamentally different from mine. That does not mean that we have to live separately.

In regard to the last point, you are saying that you don't want to eliminate all potential aliens, but you want to eliminate ones with values that you really dislike. I think that is basically racist.

There is some truth in it, however, insofar as in reality, for reasons I have been saying, beings that have fundamental desires for others to suffer and die are very unlikely indeed, and any such desires are likely to be radically qualified. To that degree you are somewhat right: desires like that are in fact evil. But because they are evil, they cannot exist.