Cassandra complex is a real and horrible state of mind. It affects anyone who has to compartmentalise, or chooses to for whatever reason. I've seen it eat up more than a few people, and it definitely affects me too.
My father was in the airforce and went to the South Pacific on nuke tests. He often had the thousand yard stare and "didn't want to talk" about there "being no future". Another member of our family is a climate scientist who did some particularly disturbing research. He has the same look sometimes. He says there's no point telling people - "just live your lives".
For me being in cybersecurity is watching a "slow motion suicide by apathy". The unfolding, preventable catastrophe haunts me.
But deep down we do want to tell people because even if you can't "change the world" it's hard to live and interact with people you love every day, knowing what you know.
Most of the time the Casandra problem is that either nobody believes you, or nobody cares. Bergstrom's problem is that others want to actively prevent her from speaking, which I imagine is worse.
Those with power really worry that we "scare the children". I even find myself saying it to fellow hackers when we are giving talks, because the effect of telling the plain truth is not action, but hopelessness, and I don't want to put that on people.