OK, so I was wondering, would there be any such thing as an irrational fear in TMA universe? If you're afraid of something, it most likely falls under the domain of at least one of the entities, and this entity will manifest horror to keep you afraid. This means that there is actually something to be afraid of, so it's no longer irrational. Maybe all irrational fears are all rational fears of things the entities have done. For example, I'm sure people would say being afraid of mannequins is irrational, since they're inanimate objects, but now it's totally rational for Jon to fear mannequins wholeheartedly.
I don't know, I'm talking in circles at this point. I'd just be interested to hear what you think.