From the Wall Street Journal Opinion Editorial:

"availability bias," roughly the human propensity to judge the validity of a proposition by how easily it comes to mind.

Their insight has been fruitful and multiplied: "Availability cascade" has been coined for the way a proposition can become irresistible simply by the media repeating it; "informational cascade" for the tendency to replace our beliefs with the crowd's beliefs; and "reputational cascade" for the rational incentive to do so.

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It may seem strange that scientists would participate in such a phenomenon. It shouldn't. Scientists are human; they do not wait for proof; many devote their professional lives to seeking evidence for hypotheses (especially well-funded hypotheses) they've chosen to believe.
Less surprising is the readiness of many prominent journalists to embrace the role of enforcer of an orthodoxy simply because it is the orthodoxy. For them, a consensus apparently suffices as proof of itself.

With politicians and lobbyists, of course, you are dealing with sophisticated people versed in the ways of public opinion whose very prosperity depends on positioning themselves via such cascades. Their reactions tend to be, for that reason, on a higher intellectual level.