Worse, there are entire subjects that have been pushed aside by interested parties systematically building a consensus through media that some topics are "discredited" or "unfounded" or "unproven" theories, or even "conspiracy theories," to the point where most people will automatically dismiss them if they are brought up in conversation. The difficulty is that if you don't have a direct interest in the subject, you are very unlikely to spend the energy to investigate the subject yourself and make an informed decision, and those who want to suppress backlash know that.

"Roundup? I never use that stuff. Who cares?"