The biggest mistake propagandists make is being 100% one direction or the other, which for most things is statistically impossible. They claim the slightest climate change is 100% bad and 100% the fault of man, which couldn't be true. They would be far more credible, and far harder to detect, if they went for an 80%/20% mix. But they are unwilling to risk that 20%.
The leftist news media used to try for an 80/20 ratio to maintain some fig leaf of credibility, but Trump triggered them to throw all that out the window.