Humans have a strong tendency to confirmation bias. We were taught against that, and even so, it's a strong motivation. I recall a number of examples we were given where a group latched on to some theory or explanation and simply wouldn't let it go, discounting contrary information and clinging to failing "facts" in support.
The usual path is "Form an opinion, then seek confirmation and ignore/discount counterfactual information". With THIS group, that strikes me as being much less prevalent than with most groups, which is one reason this is such a good group.