I'm not sure I see the contradiction, could you change the wording a bit or explain it a bit differently?
Sorry! >_< I mean to say that you've indicated(I think?)that the NAP is independent of laws but then abolishing slavery(was that adding or removing a law?) didn't help to free anyone.
My point is legislating morality creates a sharp divide in an otherwise smooth transition.
Change does happen, I think people are becoming more accepting of others as the world becomes more connected.
