I find it amusing that the vast majority of the comments here are critiquing the methodology (nothing wrong with that), instead of discussing the conclusion: "Happiness is love. Full stop."
It's actually really hard to get to the end of any article. I had to click the link again to see what you were talking about. But yes, Happiness is love, very profound.
Would definitely recommend this movie as it portrays McCandless's tragic story with great heart.