I would expect nothing less of you, Diana. If curiosity could kill... but I'm glad you're settling. It's not a bad place when you get down to it.
Interesting theory. The honest answer would be 'I don't know' as my research here has been heavily weighed in other areas.
My take on the ghosts would be that they are independent entities. The Library Ghost will make book recommendations if you sit for a while. If they were drawn from our trauma I would expect more violence and malevolent activity, wouldn't you? There seem to be very few people here who have had easy lives.