A few thoughts on the article:
1. The guy, at this point, is only a claimed census worker
2. 635k Employees: Assuming they met the profile of the 'average' population, I'd expect to see ~34 Murders, 186 rapes, and 1744 assaults over the course of a year.
Basically, any time you pull that many people together you're going to have criminals.
That being said, census worker or not, you don't have to invite them into your home, just fill out the form and mail it in, then the census workers generally don't have a reason to come to your house.