How does Krakauer and McCandless being so similar affect how the reader reads the novel?

Many people feel that Krakauer was rather sympathetic if not outright biased towards Chris. In his writing some people find is a certain heroic slant to Chris's story. I think the novel becomes more readable not because of bias but rather that Krakauer understands MCandless. He sees in Chris similar motivations and attitudes. This gives the book a depth of meaning because Krakauer is a great writer and Chris somehow inhabits parts of Krakauer's belief system. I think Krakauer is critical of Chris in how he treated his loved ones like his sister but there is a kindred spirit thing going on that gives us a access to Chris's world.