At Psychology Today Blogs, Bobby Hoffman offers some techniques for avoiding falling into the sewer of falsehoods that masquerades as news, particularly on “social” media and propaganda websites. In the course of his exposition, he makes this point, which we see played out many times a day:
In other words, implausible theories are those where any opposition to the idea is refuted by the originator, regardless of the rebuttal type. For example, some people contend that moon landings never occurred, but no evidence supports this position, while abundant evidence refutes the idea that moon missions were fabricated.
The refutation problem is typically addressed in two ways by those who harbor irrefutable beliefs. Too much evidence means a conspiracy theory is being advanced. Too little evidence means there is a cover-up. The conspiracy supporter can never be wrong!
I commend his article to your attention.