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From the text:
The more they talked, the less Alex struck Gallien as a nutcase. He was congenial and seemed well educated.
Gallien thought the hitchhiker’s scheme was foolhardy and tried repeatedly to dissuade him: "I said the hunting wasn’t easy where he was going, that he could go for days without killing any game.
Gallien briefly considered stopping and telling the authorities about Alex, then thought better of it. "I figured he’d be OK," he explains. "I thought he’d probably get hungry pretty quick and just walk out to the highway. That’s what any normal person would do."
Into the Wild