They found a hundred and fifty of them over several countries and they are so new they haven't named them, but they CAN make the determination that the religious zealots worked in secret and probably felt superior to the poor huddled masses they oppressed. I am surprised they didn't just come out and say the storehouses were filled with the food taken from the poor to spoil the "religious oppressors".
what tripe.
And this business of digging and refilling trenches as ritualistic? My first thought is that it had to do with drainage, perhaps management of livestock, or even waste disposal.
LOL