The book "Forbidden Archeology," which is mentioned in the above article, also has a section on Sasquatch aka "Wildmen"
Here is a small quote from it [with my emphasis]:
"Skeptical scientists say that no one has found any bones of wildmen; nor, they say, has anyone produced a single body, dead or alive. But as we have seen, hand and foot bones of wildmen, and even a head, have been collected. Competent persons report having examined bodies of wildmen. And there are also a number of accounts of capture.
"That none of this physical evidence has made its way into museums and other scientific institutions may be taken as a failure of the process for gathering and preserving evidence.
"The operation of what we could call a knowledge filter tends to keep evidence tinged with disrepute outside official channels.
"However, some scientists with solid reputations, such as Krantz, Napier, Shackley, Porshnev, and others, have found in the available evidence enough reason to conclude that wildmen do in fact exist, or, at least, that the question of their existence is worthy of serious study."
I think that "knowledge filter" is also at work on pretty much all of the paranormal type topics in our society.