Shoot. This whole thing is like a revisit to a conversation I was having just this weekend about art, messages, and audience reception. It was a long winding conversation, as they often can be, but one of the points I brought up was that sometimes when people like art for the aesthetic, they can miss out on the message. For example, people who walk away from Saving Private Ryan with the takeaway that war is an adventure or Fight Club in that anarchy is cool and hip. It seems to me there's not a lot, short of abandoning all subtly and nuance, that creators can do to prevent those kinds of things from happening.
I don't disagree with your premise, but I don't think in this case that it was a question of too much subtlety or nuance on the part of the show. It was just racists being butthurt that the main villain of the show is a white supremacist.