It's a weird reinforcing loop. Institutions like WHO and others would publish a study with good research but also doomsday scenarios w low probabilities. Journalists and publications (institutions of trust #2) pick it up, and in order to simplify and get attention, focus more on doomsday scenarios. The other institutions (eg: govt. or non profits and advocacy groups) and fact checkers pick up same story believing the doomsday scenario to be the most likely one. They publish more opinions, studies, articles, reports etc. and end up creating a situation where no one can get a good understanding of the topic outside of her field. There is so much information that it is hard to gain a handle on that, and here is where I think even 20% propaganda may not be justified.
That's the playbook your opponents will use - and if you want to get anything done, or prevent things from backsliding, you have to follow suit.
Hate the game, not the player. People don't make decisions based on rationality, they do it based on emotional appeals.
Learning about novel risks can keep you alive, through preparation and/or action.
While on the other hand nobody tries to fix good news.