Completely agree. Saying Mephala is tricking them into thinking the DB is actually worshiping Sithis just takes all of the evidence that is presented and throws it out the window. There's not any evidence to support the other side. It's just a bunch of stuff that some guy made up to sound cool and some other guy went along with it because he thought it would make him sound cool too.. eventually, we end up with a bunch of people believing something that has absolutely no backing in game.
Try to stick to the issues at hand in the future. Trying to discredit your opposition with personal attacks only reflects poorly on your own self.
But our contention with the Dark Brotherhood isn't some lore-stunt-piloting-dike-measuring-contest. We recognize the corpses, the literature, the testimony - but that's all ipse dixit, lots o 'telling, not a shred of showing.There is no
empirical evidence of Chatty Sithis, is the point.
However, we do have plenty of examples of Webspinner compelling people to obscene hijinks, further, the collective-unconscious anamnensis of graven un-images of the Doom Drum are well-documented. To ignore that evidence (a great deal of which we, the player-character, have experienced first-hand), in a universe where every story is a fractal pattern of THE story, is to move totally against four games worth of backstory.