I remember being highly skeptical about these 'cults' when I first heard of them, I presumed that it was 'White' Propaganda and historic revisionisim to show how 'vastly superior' We were over them.
then I went to Chisoul where I witnessed this first hand, a lot of what they say in the article about it being their version of a 'Gaelic revival' called Kastom makes a lot of sense, but yeah the cargo Cult is a very real thing, the aulfella 'joseph' that I talked to about it remmembers it, it started in the 20's and thirties with missionaries, but at that stage it was only small scale as the boats only cvame once a month, he saisd that it would have died out except for the American involvement in the islands during WW2.
Bear in mind that the locals prayed vigorosly during the thirties for more Cargo, then as if by magic their prayers get answered in the 40's, you can see how shrewd 'priests' could twist these events to 'prove' that their faith is not unfounded.
the old 'runways' that they built can be very interesting too, they demonstrate a basic understanding of what a runway is for whilst its abundantly clear that there is no understanding of the principles involved in how they work, I've seen one that was curved, I've seen one that has the peak of a hillock in the midle of it, I've seen whats left of one carved on a sand dune.
I had a theory in the CT Forum that Some of the Nazaca lines came about in the same manner