Chris is a rebel first because of anger at his parents, people he accuses of trying to buy his love with material goods. He rejects their values and tries to live as simply as possible. He writes:
I'm going to have to be real careful not to accept any gifts from them in the future because they will think they have bought my respect.
Second, Chris rebels against the materialism of U.S. culture because he believes a simpler life is a more joyful and fulfilling life, writing: "The freedom and simple beauty of it is just too good to pass up." Later, he writes that he has found "the great triumphant joy of living to the fullest extent."
Finally, he believes the core of life lies in embracing adventure, not living a monotonous middle-class existence. As he writes to his friend Ron Franz"
The joy of life comes from our encounters with new experiences, and hence there is no greater joy than to have an ever-changing horizon ...
Chris's reading of Thoreau and Tolstoy, his strong will, his desire to live fully and authentically and his rebellion against his parents' values led him to adopt a counter-cultural lifestyle, one, he said, that filled him with great joy.
On page 57 of Into the Wild, Chris McCandless writes, "The very basic core of a man's living spirit is his passion for adventure." He writes this in a letter mailed from South Dakota to his friend Ronald Franz, and, in the letter, he urges Ron to abandon his safe life in Salton City, California and to hit the road in search of adventure. He tells Ron that there is no comfort in a staid and settled life and that he will begin to enjoy a carefree, adventurous existence once he embraces this type of lifestyle. Though Franz was eighty-one years old, he took the advice of McCandless, who was twenty-four at the time. Franz placed his belongings in storage, outfitted his truck with bunks, and hit the road, heading to the desert (to the same campsite where McCandless had stayed).
McCandless had first met Franz in 1992 when Franz was 80, and Franz drove McCandless from Salton City, California, to Grand Junction, Colorado. When Franz was serving overseas in the army, his wife and only child were killed by a drunk driver, and Franz turned to alcohol. It's likely that Franz saw McCandless as a replacement son figure. They became quite close in the time they spent together.