Of course they were killing them because it was a secret sect. A people's religion. do you know where everything comes from?
It comes from a hut ,from a village, from learning then there is an elder. Then there's always some asshole who wants to take advantage... if you cant beat them join them right? And many were killed...it is describing two stories at the same time as above so below. Have you any clue what the toltecs achieved for example? do you think there's separate stories going on in different parts of the world or is it just 1 concept album?

Sons of thunder my friend...
“Boanerges”