[rglover]

Pick any news story and a journalist (from an outlet like NYT, Politico, etc).

Watch the timeline of that journalist's original opinions (and their level of aggression/assertiveness) and then watch how that cascades to either more extremism—if the evolution of the story agrees with their chosen narrative—or, to absolute abandonment of/ignorance of the thing they so fervently held an opinion about a few hours earlier.

Once you start observing this behavior, you will see it happen for nearly all stories. It's like watching rats press a lever to release food pellets and then scattering off to a corner to digest.