My friend Katherine Myronuk once told me, "All complex ecosystems have parasites." She was talking about spam and malware (these days they're often the same thing) and other undesirable critters on the net. It's one of the smartest things anyone's ever said to me about the net - and about the world. If there's a niche, a parasite will fill it. There's a reason the cells of the organisms that live in your body outnumber your own by 100 to one. And every complex system has unfilled niches. The only way to eliminate unfilled niches is to keep everything simple to the point of insignificance.
Used availability for Cory Doctorow's All Complex Ecosystems Have Parasites
January 2014 : USA, Australia, Canada, UK Kindle edition