"What the banker, philosopher and linguist all have in common is that their adventurers on some level. People who crave the new. At least, that's what they say. Herzog hints that for some, they're running away from the overwhelming confines of civilization. He then flips that and hints that many of the hallmarks of civilization are replicated in the wild. When a penguin becomes disoriented and wanders off towards the mountains, where it will surely die, it's obvious from both Herzog's narration and what he's shown us before, that he's linking the behavior of the people he's interviewing with their environment."
More at the ATL 365 blog.