I think the GP's post should be read as "He's not a romantic hero. He was just stupid, and he died because of it." That is, it's not addressed to McCandless himself, but to Jon Krakauer for painting him as having some kind of life lesson to teach. And to fans of the book who romanticize it.

McCandless didn't ask for any of that, and I concur that he was welcome to commit suicide his own way. But it was suicidal, and everybody knew it, so it is necessary to add the cautionary tale whenever he's brought up. It would be best, as you say, if we all just ignored him.