I'm not sure you can really bring logic into moral arguments. But if I had to try to, i'd go along those lines.
1) Any creation of Neanderthals is bound to imply risks. Maybe there is some DNA that's missing and the poor creature die much earlier. Maybe it's nervous system get detroyed by the mom's immune system. I don't think you have the right to take that risk.
2) Humans should not be used without their consents. This include creating humans for SCIENCE! Humans should be a end, never only a mean.
3) There is also a form of ethical laziness here. Right now, our ethical code is largely based on the fact that there is a clear distinction between humans and non-humans, due to the fact that our whole genus died off. This make it rather convenient to have a moral code, for exemple mentally disbabled people are still worthy of being treated as human and we won't use them in medical experiment. I'm wary of blurry this distinction.
I'm aware point 3 is rather weak, but it's also the less important of the three.
1. I think we do have the right provided we do our very best to reduce the risks as far as we can, but if "as far as we can" means there is still a huge risk that they might be born into a life of suffering we just shouldn't take it.
2. The Neanderthals would only be used with their consent, provided they are indeed sentient.
3. Some would also argue with you on point 3 on the fact that other animals suffer from that ethical code greatly, so maybe it's time we had a shakeup.
I don't believe the moral implications matter at all as long as they've got the same rights as we do, aren't hurt or mistreated in any way or held against their will.
...He said, just after stating how they should be kept in concentration camps "for their own safety".
Perhaps you should consider whether you are disagreeing with me on the basis of logic or emotion/instinctive revulsion.
Perhaps you should consider whether you are disagreeing with them on the basis of logic or emotion/instinctive fascination.
They would have the choice to leave the camps/lab/barracks (wherever they will stay), provided they understood what they were going into.
I already know I disagree with him on the basis of both logic and emotion/instinctive fascination. You don't need to remind me, although it's a kind thought.