at any rate rights that are described as being eternal or some other version of that such as inalienable, or in the case of copyright moral and intrinsic, are rights that if the government, that has heretofore described that as inviolate, where to casually violate them then the government would be declaring its own nullification to exist further by its previously stated rules.

Not to say this doesn't happen, I believe we can see it happening in some places in the world right now, but these are classes of laws that cannot "just" be changed at the government's whim, and in the EU copyright law is evidently one of those classes of law, strange as it seems.