Political correctness feeds off of ignorance. The postmodern Marxish religion of grievance only survives when the light of reality is snuffed out. Why do you think “social justice warriors” are so concerned with “safe spaces”? These people fear anyone who challenges their worldview. They know that outside of their concocted social justice bubble their arguments not only fall flat but are likely to be obliterated. However if they can scare everyone into toeing their line, or at least into not challenging it, the SJWs can bring enough people into the cult who have no understanding of history, of The Enlightenment, of the real challenges in Western Civilization, of really what being an educated person is, that they can eventually overwhelm those insist on things like “truth”.