something I haven't seen brought up or discussed really, is about the time difference between the original crimes and the present day. some or all of the old men in that video could be dead by now. judging by carcosa and how Errol kills/lives i would guess that the cult is disbanded or at least drastically different then before. maybe when Tuttle was robbed and ultimately killed, they all got scared and stopped their practices.
somewhat related, the scene between Marty and his father in law in one early episode, Marty quips back about how it's good that the old people will die off, after pappy-in-law talks shit about the current generation. maybe this goes for the cult too? their kids saw how fucked up their parents were and wanted nothing to do with it. except Errol and Ladoux and the other guy, who I'm guessing were victims and exceptions to this. Errol also making a big show of his killings was unlike the cult too, which gives credence to the cult having dissolved. this is all just IMO stuff, forgive me if it's been proven wrong already