What's your terrible truth - your explosive idea? More formally, what would you put forward as a proposition that is, you believe, true, but too dangerous to present to the general public? Or if that sounds too elitist, at least something that you'd want to present to the public very carefully, so as not to give misleading impressions that might be disastrous when they play out?
This has become an issue in my little corner of the blogosphere over the last few days, and I am open to the idea that such truths exist. At my prompting, Jean Kazez offered some on her long blog thread - in addition to truths (if such they are) relating to moral error theory.
I'm open to the idea that some truths should at least be handled carefully. Among them are truths that debunk or deflate the authority of moral judgments. If I were to write a book that is my equivalent of, say, The Moral Landscape, I'd be presenting anti-realist truths about the nature of morality, and these might be more disconcerting than realist claims. But I'd be doing so carefully - not just writing, "All yoar morals iz rong" or "Ur moraliteh sux."
On the other hand, human societies have had to absorb many ideas that were once considered dangerous, even explosive. These range from heliocentrism to the well-supported claim that our species descended from apelike creatures, to the unavailability of divine punishment and reward to ensure that cosmic justice is done, to the revelation that most of us constantly over-estimate our own talents and abilities (not to mention such things as the gniceness of our friends, relative to other people). So far, we've survived as a species, and even developed increasingly peaceful and healthy societies in the privileged West, despite the widespread promulgation of these various claims, all of which I believe to be true.
Again, what's your explosive idea? And why?