I mean sure, they're the ones who come up with the heresy in the first place, but if the people and those who aided them had thrown them off the city and killed/imprisoned them/etc., they would have never gotten anywhere and accomplished nothing, but I see little blame and focus being put on these people; the heresiarchs get all the attention when it is those who aided, enabled and heard them that merit even more condemnation.
Tsk, tsk.