re: Scientific Skepticism Is Supposed To Based on Science Not Wishful Thinking
The point is, whenever a scientist does raise a question, he or she is attacked, not debated. Usually by raising questions on their competence, connections, funding sources, etc.
One technique is imposing a requirement for an extremely narrow set of formal credentials and publishing records to be "authorized" to speak on the subject at all. I can think of no other controversial scientific issue where this is true to this extent.