What asumptions are made about who "does crime"?

Check out the first paragraph of this New York Times story about Philip Markoff, suspected of robbing, and in one case killing, women on Craigslist who were advertising massage. What does the set-up of the story say about what the author (and a specific general public?) finds surprising about this story? What assumptions are being made? How does race, class, and ideas of "normal" families play into those assumptions and the contrast set up at the end of the paragraph when Markoff is finally described as a "brutal predator"? What does this signal about not only how "crime" is constructed, but how who is expected to "do crime," and who is not, is not critically examined? What are the implications for those who are, as GIlmore pointed out, presumed to belong in the "criminal justice" system or the prison industrial complex?

http://www.nytimes.com/2009/04/22/us/22boston.html