As I see it, there is one of two options here... either CBS' documentary was correct and by extension means we can and should trust mainstream media sources, or the documentary is nothing more than propaganda and by extension means mainstream media sources in general cannot nor should not be fully trusted to present the facts.

As I mentioned above, can't help but find it ironic all of these so-called conservatives who would have us believe that all of the mainstream media sources are pure propaganda, would now have no qualms whatsoever in believing what said sources are saying because it presents a narrative that they wish to believe is true and follow (the anti-Ukraine narrative in this case). Just an honest observation there, so make of that what you will.

@SpikeTalon well, I would say the mainstream usually lie, but occasionally they either let the truth come out by accident, a form of damage control (i.e. they can no longer repress what's blatantly obvious, or want to regain trust/credibility) or because telling the truth is more advantageous to their narrative/plans.
I personally don't trust the mainstream, and what I've seen coming from independent journalists (of varying nationalities), tells a vastly different story.