Yeah, what Artemesia said. The books were in way authoritative, I thought The Dream made it pretty clear - you find each on in the lair of that faction. Hello? How could it have screamed "propaganda!" any louder? :-)
But, that exactly, was a main part of the plot for the 4th - that these invaders aren't unlike the humans in one aspect: They have reasons for what they do, and they think of themselves as the good guys.
