The controversy of incest aside, the salient point about nuance is very important. Most people never muster the wisdom to be able see beyond the black and white of an issue. Shades of grey are most important because the depths of reality are not a simple equation and human existence would be a lot better in the here and now were more of us willing to expand our minds sufficiently. It's why I've coined the expression "Having thoughts doesn't make you a thinker." Humans would do well to consider often better ways to think.