When it comes to slavery, are things "nuanced" and "gray?"  When it comes to slavery, do states rights, vs. federal law matter?  No.  In fact we fought a war over that.  Turns out the south lost and the federal government is what mattered.  (Rightly so!  What horrors would have gone on had the south won?) 

See--the thing is--when people want to rationalize and justify sin, it is always complicated, always "nuanced."  It is never easy and never black and white.  G.K. Chesteron said that moral issues are very complicated--when you are looking to justify sin and evil.  

As Bob Ross used to say when painting "It is just that easy!"  I will steal his line here: It is just that easy.  If people stop trying to rationalize sin and evil, they will see that it is not as complicated as they think.  They only want it to be complicated because the more complicated they can make it, the easier time they have to justify sin and evil.