The OP uses the word "insane", not outlier. It's clickbaity, and used in jest, but I think it better captures a subtlety of this phenomenon: The prolific commenters are molding every discussion in their image. They might have an interesting angle on the story, or they might just be saying trivial things with beautiful prose. In any case, there is a lack of diversity in general -- discussions are driven by the worldview of a few.
That would be an argument for lurkers to make an effort, even if, like this comment, it's just a barely-formed idea.
Edit: "molding the discussion" -> "molding every discussion"
In other words, we only hear and watch stories from those people who chose storytelling as their career, and if you assume we are inevitably influenced by their views then we're effectively taking advice from them. This means entertainment shapes the viewer-listener's interpretation of reality to better fit the model of reality to which storytellers subscribe, but I'm pretty sure that's not a desirable outcome in the long run.
In a recent interview, Michelle Obama said we only ever tell young people about the good parts of marriage. We hardly ever explain to them that it has its ups and downs, that it isn't "broken" if suddenly the lust isn't there like it was in the beginning. She presented the argument in a much more cogent manner, but in any case, if you believe her to be right, then this seems like a specific (important!) example of this broader trend.
There are countless others out there who go on to live perfectly happy lives with perhaps much more useful advice to us, and who would arguably be a better influence overall – you just don't hear about them.
There has been a transition from culture being produced by members of one's community/village/family to culture being produced by professionals for money.
Stories and songs of the past were just as unbalanced and insane as stories and songs of the present. (Both in terms of being fantastical and showing only one side of complex emotional situations.) People grounded in the reality of making living things grow, keeping animals alive, and fixing their own houses and equipment most often understood those stories for what they were. What magic such people believed in was often closely tied to feelings of belonging and community. Gatherings of people often have such magic feelings, but this is quite a real phenomena of human social organization.
Now, there is less of such intense community, and we are bombarded by more commercially produced culture than we could possibly consume, made by people who often live lives of exaggerated imbalance, enabled by what our ancestors would have considered the phenomenal wealth of modern resources. What's more, so much of what we're given as non-fiction also fits into this model by varying degrees.
When Rome's military went from citizen soldiers to full time specialist professionals, the misalignment of incentives between the specialists and the citizens was the subtle, long term root of many problems. I think there is such a misalignment with how human civilizations in general produce culture.
I think this phenomenon may be a "Great Filter" answer to the Fermi paradox. We might not only be swallowed up by Virtual Reality, but also by the purely mental constructs of our own fantastical narratives, as we abandon more and more of the creature connections with nature which keep us grounded in reality.
(Plato. Cave. Shadows.)
I have certainly seen this shift in culture creation to professionals within Christian communities in the US. The modern megachurches (2000+ attendees) are rather different culturally from the small community churches of the past (~150-200 members). The shift has coincided with increased political polarization (e.g., Jerry Falwell and his relatively early megachurch) and personal isolation.