But isn't it just a failure to communicate it? What if almost all other people are similarly disillusioned?

Also, according to psychologists, one negative experience outweighs roughly five positive experiences of the same magnitude. So, as we get older, we might have tendency to accumulate negative experiences, and as a result become more cynical and less idealistic. And so it kind of perpetuates.

That…. Just provides more evidence their world view is likely more objectively true?