Unfortunately, phantasms[1] and mass delusions are also very much possible. Increasingly, opinions don't need to be compatible with factual reality to be believed.

[1] https://www.reddit.com/r/Anarchy101/comments/pyfhzb/please_e... (Sorry for the Reddit link, it's the most succinct explanation I could find)

That’s true… and it’s perfectly compatible with what I wrote.

Delusional people do not speak in terms of opinion they present their perception as facts.