Society is not an epistemic community. Its purpose is not to find the truth. When will you "people who care about truth more than about how you look"1 get this? That not all true things should be said, at least in public. These things might hurt public order & morality, and people will ostracize and fire you for them.
1 note: right, I changed it. It's the same, though. Also, "Are you afraid to say that there are significant heritable intelligence disparities between ethnic groups? It's the obvious conclusion ..." violates our society's established standards of discourse.