Self-censoring is part of the frontal cortex's normal function. I only hear this word 'self-censorship' brought up as a boogeyman. If people have an axe to grind against some part of mainstream culture, why not just say it out loud instead of priming their readers with FUD? (fear, uncertainty, doubt).
Self censorship is indeed driven by the judgement portion of the brain, however, what is being mourned here is the constantly shifting and uncertain ground on which our current society puts its taboos. What was once a socially acceptable position to have in polite society, is no long so. Instead of slowly changing over the course of hundreds or thousands of years, it's mutating at a breakneck pace. Most people in my experience just want to live and let live. Not exhaust ourselves at the latest target of the two minutes hate outrage machine.