Earlier quoted context omitted.
"Being wrong" versus "loss of contact with reality" is simply a matter of degree.
In general, "loss of contact with reality" is well understood to be an individual experience. If you think voices are talking to you, that's schizophrenia. If you think God wrote an entire book of life advice, that's Christianity. So, kinda by definition, a large group of people cannot generally experience "loss of contact with reality", they're merely mistaken. The alternative is to accept that 90% of humans are suf…
So just, you know, don't do that. Select a boundary that places 90% of humanity on the side of "wrong about a number of things but within the bounds of normalcy for the species at large", sprinkle in some caveats about "in the industrialized world" and "for someone with at least a highschool education" and such, and you've got what I was actually describing.