Yip, I get that thing about people saying he was stupid doing what he did. I watched the movie with my parents and I had to endure "He is crazy/not normal/stupid story" comments every 5 minutes. People from previous generations are very conservative in their viewpoints and life philosophies, primarily because of their social and political structures at those times. Even where I live (South Africa) we were indoctrinated with the aphorism "werk, trou en kinders kry", which means "work, marry, get children", and if you stray from that path you are not deemed fit for normal society and frowned upon. That is why McCandless's views are so controversial, but fundamentally I tend to agree with him. Especially after I read Walden, which later inspired me to read Krakauer's book. Great story, and if I had half the courage McCandless had I would be a very happy person.
(And if Eddie Vedder's "Society" is playing - and I get a bit too overwhelmed by commercialism and greed and all the other rotten fruits of society - who knows, I might book a ticket to Alaska and enjoy being immersed in raw Nature!)