Looks like somebody was forced to read Walden as a child... This article is actually pretty good as a case study in taking some out of context quotes from a largely neutral historical figure and making that figure out to be the devil. It'd be a waste of time to go through the whole article and explain why the author misunderstood most of those quotes.
Hell, I don't really agree with Thoreau at all. But I still think it's worth questioning whether society and civilization are actually good for humanity, even if you arrive at the conclusion that for the most part, they are. And I don't like that the article's tone implies that to even question some ideas makes one immoral.