Denial works wonders. It is our brains smartest coping mechanism. Go figure.
People definitely do, thinking that others are as dense a black hole is the same as categorizing them or stereotyping them. It's another way to see the world through such a lens that they often don't know what is going on or they aren't able to get the full picture.
Yes, you are right , I don't think it is your cynicism.
I am one of those people who believe many people are so dense they literally dont know whats going on.
There are people who really think others are so dense they don't know what's going on, yes.