I find them all equally understandable. The god thing is the most outrageous, but it has the strongest effort behind it (that is, people push it harder). They are all explained by human stupidity. That is why there are lists of informal (and formal) fallacies, because people are apt to reason poorly. If it were rare, there would not be such long, detailed lists of how reasoning can go wrong.
And if you really want to be depressed, you can read about how thinking can go wrong in ways that have not been catalogued:
http://web.maths.unsw.edu.au/~jim/wrongthoughts.html
And if you really want to be depressed, you can read about how thinking can go wrong in ways that have not been catalogued:
http://web.maths.unsw.edu.au/~jim/wrongthoughts.html
"A wise man ... proportions his belief to the evidence."
— David Hume, An Enquiry Concerning Human Understanding, Section X, Part I.
