I have a few speculations about this puzzle.
1.) When it came to this case, Fiona was biased, as I illustrated in
this post. Her bias might have been attributable, at least in part, to the fact that she "fell in with the wrong crowd." She joined PMF on the 11th of December, 2009, which was a week after the OP of the cartwheels thread. Her first comment on PMF included this statement: "I have only been following this seriously for a few days and I have found this site awesome for the wealth of information and the tone as well."
Perhaps they took her under their wing and she became attached to them. The PMF members who have been in the inner circle have struggled painfully with expressing their disagreements, and it is usually very hard on them when they are banned, as everyone who openly disagrees there eventually is.
2.) Fiona had emotional difficulty dealing with certain personalities. She expressed her contempt for me a number of times (which also may be attributable to the onslaught of negative PR I received on PMF when I first started on JREF).
Believe it or not, the argument that finally sent her packing was one with halides1. Is there anyone here who is more rational or more even-handed than halides1? A person has to really
want to tangle, to get into it with halides1, and then go to another website and complain about how rude and irrational the JREF posters are.
3.) Fiona was not used to being wrong. I could be completely off base about this, but isn't there a number of discussions on JREF that involve the expression of opinions that aren't necessarily based on fact? I mean, the
facts of Sasquatches or psychic phenomena may never be known in our lifetimes, so people must use reason and logic exclusively to reach conclusions about their existence.
In this case, however, facts can be known and facts are known. This is something a lot of the guilters, e.g., Fulcanelli, had trouble acknowledging. Fiona may be good at reason and logic, but in this case, they do not suffice.