My favorite post apocalyptic cult is the one featured in A Quiet Place 2. This world features aliens that will kill anyone who makes a sound. The protagonists are captured by this cult of like 30 people with little intro to who the hell they are. They do this strongman creepy virtue signaling for a while and then tie up Jim’s replacement with some noisy chains on a dock. Surprise surprise, Not Jim makes a noise (not with the chains for some reason), and sure enough the entire cult is immediately wiped out.
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How did these people canonically survive for so long doing these dumbass shenanigans?