Faith, for example, has personal theories about geology, molecular genetics, evolution, palaeontology, and more - despite having no education at all in any of those subjects.
That would fall under the self-deception part of the venn diagram:
Enabled by the Dunning-Kruger Effect where ignorant/incompetence is unable to recognize their failing ability and think they have a superior understanding. Because they don't know much they think by comparison the scientists (& everyone else) don't know much, so their opinions are equal to the task. Take creation ... please ...
At least part of this must be a total cluelessness about how science is actually done, the standard of evidence required to make a scientific claim and the necessity to fit the claim inside a pre-existing body of knowledge. Any claim that is inconsistent with other established findings requires substantial confirmation.
Except those who have never done this for any of their beliefs/opinions don't know why it needs to be done to validate those beliefs/opinions.
Having fairly recently published a scientific paper on a relatively simple idea, that took several years of real hard slog plus another year of review and criticism, ...
Congrats.
... this struck a chord with me
But they have to want to learn, and that is another issue. It's the ones that don't want to learn that are the problem. Those that want to learn, do learn, they are the ones who can modify beliefs to conform to reality.
Enjoy
Edited by Adminnemooseus, : Fix first quote box.