Oddly enough I didn't really notice the implied value judgement/moral, just enjoyed the creepy side of it. Then again, like I said, I grew up in an area where mid-to-heavy industry was the norm; and I love that kind of landscape, so maybe the punchline was rather lost on me...

(Also, it's amazing what you find growing in industrial complexes, btw. If you think nature can't find a way, you've never seen rosebay willowherb. ^_^)