The question is, why?
In their escape from sure cannibals, they attract nearby monsters, who wreak havoc on the dock folk.
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Soon after his horrific discovery, the monster chases after him and decimates the town.
This quickly explains away the plot hole, but is nonetheless contrived.
Or maybe there’s a different explanation entirely - a clue to their intellect.
Next:How A Quiet Place 3 Can Properly End The Trilogy (What Needs To Happen)