Well now you're equivocating. We've established one that you can't deal in in a specific country. _Should_ is quite a different question. You can't establish should by establishing is.
Well that would seem to make the rights in question not particularly inalienable. In fact if we're talking about the US slavery _is_ legal in certain contexts. So it's definitely not inalienable. Only in the context of voluntary agreements between private citizens.