This guy's still trying to find the brains in there.
Evolution of bias:
Even though technically nobody's been around for more than 130 years, we still have thousands of deluded folks who base their hates and loves on something their great-grandparents may have heard about from _their_ grandparents.
Take a group of kids from all around the world and raise them on an island, with of course a method of clothing, food and shelter, and eventually, over generations, there'll be biases that develop. Like
That Group Over By The Trees, who think the
Group Near The Lake are radical nutjobs who seem to find climbing skills unimportant compared to swimming skills. Then there's the
Group Near The Rocks that think the other two groups are nutters and should focus on their carving skills instead of that wasteful climbing or swimming thing.
Then they start generating a
History where someone took one too many bananas and made someone else mad and took too many pomegranites, sparking an argument that gets passed on to the next group of kids. Legends are born, and lacking a unbiased record of events, gets mutated into some horrible behavior pattern that of course applies to the current generation that lives in each of these regions. Nothing to do with the actual behavior of anyone, just expectations and tales that shape their perceptions.
What is the point here? Not sure, but dang if this island hasn't got a lot of wild stories going around that keep everyone from just plain enjoying where and how they live without some stranger coming in and saying they're wrong just because it's' not how they do that where they come from.