Why does the author feel that Chris McCandless's favorite author is Jack London?

From the text:

McCandless had been infatuated with London since childhood. London’s fervent condemnation of capitalist society, his glorification of the primordial world, his championing of the great unwashed—all of it mirrored McCandless’s passions. Mesmerized by London’s turgid portrayal of life in Alaska and the Yukon, McCandless read and reread The Call of the Wild, White Fang, “To Build a Fire,” “An Odyssey of the North,” “The Wit of Porportuk.” He was so enthralled by these tales, however, that he seemed to forget they were works of fiction, constructions of the imagination that had more to do with London’s romantic sensibilities than with the actualities of life in the subarctic wilderness.