Among the many silencing mechanism applied to non believers, is the peer-reviewing censorship:
The more Occident is secularized, the more the sciences are being used and conducted as religions. It seems like the roots of religion are shaped by darwinian evolution and are so intense that people can not live without strong beliefs, moral rules, priests and strict obedience. The magazines of science behave more and more as medieval publications ruled by guardians of the orthodoxy. It is not like the good old times, when debates were about pure scientific discrepancies. Now it is more like pure believers of the true Faith against deniers.
When the left enforces his personal worldview in scientific magazines and universities for every non experimental disciplines that have political implications, such are global climate, sociology, psychology and, in general, human sciences, and even the quality control mechanisms are coopted for enforcing such control, then it is normal that the intellectual debate is translated outside.