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How do you envision the castaways made a bad impression? It's not like every band of explorers immediately tries to open a Walmart or something.

My guess is that the dominant society anywhere will make you pay for not knowing their culture.

Neal Stephenson wrote a book about Vikings discovering a Wal-Mart via time travel, and boy do they like it.

(rise and fall of D.O.D.O.)

Sold! Thank you for pressing the order button on my next book ;)

I think the comment about newcomers bringing diseases that killed many of their people would explain why they don't welcome outsiders.