Alright, that's at least understandable. Sort of. Feeling threatened by the presence of those who found themselves in this place is a motivation that makes sense, although the last thing Jopson describes is somewhat less understandable, even if it's also familiar.

"The bodies of animals have been being... Left, in obvious places, and in a state that is unlikely to have occurred naturally." To put it mildly. He presumes it's the same thing Jopson is talking about, though the use of the word 'corpses' might indicate something more than animals.