Robert Redford is also the founder of the Sundance Film Festival, so getting on his bad-side is strongly career-effecting. People lived in fear of getting on this guy's bad side.
On set, he sounds like the typical Hollywood nightmare with famous clashes with his costars and directors. Arthur Laurents, the writer of The Way We Were, described Redford as an "ego maniac" and control freak for his on-set behaviors.
I say this as a leftist, but "The Truth" is liberal catering-to, and whitewashes Rathers's lack of due diligence in the Bush document, which even to a largely uniformed person like me thought, "Uh isnt that a modern font?" Dan Rather's rush to to this story is not a 'victim' but the failure of basic journalism. I dont think Rather should have resigned, but the idea that's he's this kind-hearted innocent, as the film mostly portrays him as, is just dishonesty. Rather saw money and fame in breaking a big story, and ran with it without much care.
Shrug, I've always seen his PR as very heavily manufactured and played towards the NYTimes and Variety and Sundance crowd in a very targeted way. And it worked, Redford died with an estate worth at least $200m. Capitalism gonna capitalism I guess, but the reality is Redford was quite the vindictive partisan who used his wealth and power against his perceived political enemies and whitewashed some questionable people.