Is your point that you believe other people are just hallucinating their problems, or that you believe they've 'used it wrong' and brought problems on themselves, or that if you personally haven't experienced a bug, then it's not an important bug?
It happens when the sightings are emotional. For instance:
The Colorado Mystery Drones Weren’t Real
The mysterious drone sightings that captured national attention were a classic case of mass hysteria.
https://www.vice.com/en_us/article/884xv3/the-colorado-myste...
Flip side of same phenomenon is the "snappier" meme.
BTW, I did finally upgrade to Catalina last week and it’s been going fine, with the exception of losing 50% of my Steam library to the 32-bit graveyard....
When someone loses their data because they don't know how to use a computer it is easy to just blame the vendor.