And for postmodern approaches to combating "bad guys" consider:

Kill or cure: the smallest help must wait till we've conquered our fear of grey goo
Nanomaterials may have the power to save millions of lives, if scientists can manage the potential risks
By Keith Rodgers in San Francisco
Published: 20 November 2005

"... Just because something has a potential to reduce our privacy, it is not necessarily 'bad'," says Dr Lin. "We need to weigh the benefits of that technology (eg nanosensors that protect us by sniffing out minute traces of biochemicals) or competing interests (eg safety)...."