Heyerdahl was a great self promoter, adventurer, writer and a nut. He was a champion of discredited theories of the of the human migration. His book Fatu Hiva, was published in the '70s and was about a year he spent on Fatu Hiva in the Marquesas
in the late '30s with his then girl friend. It's been a long time since I read the book but think the adventure had something to do with his Masters Thesis.
To show how level headed and rational his research
was here are a few tidbits of what Island life was like. The local population of the Marquesas
at that time was almost entirely Catholic and to say that the locals took their religion seriously is an understatement. The Islands only contact with the outside world was the very occasional Copra Boat
from Papeete. Don't think there were any other non natives living on the Island. The last documented case of cannibalism in the Marquesas was only 40 years in the past. Life was isolated and traditional in the extreme on Fatu Hiva. So what does Heyerdahl do but make friends with the only protestant heretic on the island and isolate himself from the majority of the population. It made him a very unwelcome Haole outsider and nearly got him lynched if you believe his account.
Having said the above, Kon Tiki made it almost a certainty that I'd go cruising and Fatu Hiva gave me the impetus to get to the Marquesas and Fatu Hiva soon after the book was published. He was a great writer and Don Quixote champion of lost
causes. The value of his books
is the tales of adventure, hardship and reward, not the theories he hoped to promote.