IMHO People's minds, in the conceptual realm, work on a black-and-white basis. I find it can often be very difficult to discuss the grey region with folks.
Which is somewhat amusing, considering the underlying hardware works on a billion shades of grey.
I think ignorance relies on black-and-white whilst intelligence thrives on grey. I've seen little problem to discussions of grey areas here on HN where we prize intelligence over conformity.
Ignorance needs ignorance to survive, it's like a pathogen. The more ignorant people there are, the easier it is to survive as an ignoramus.
I've found it easy to discuss grey regions with people, so long as they're moderately intelligent - at least from my point-of-view.
Which is somewhat amusing, considering the underlying hardware works on a billion shades of grey.