I've Been Profiled!

So, in an effort to keep the library-fine-incident from occurring again, I took at stack back to the library.
The librarian checked them back and looked up at me very, very strangely. I asked her why, and she looked nervous and asked what I did for a living. When I told her I was in law enforcement, she looked visibly relieved.
Apparently, according to the books I checked out, they figured I was either a cop who liked eating and the odd spot of lit theory, or a homicidal english teacher who ate his victims. I don't see why people found that funny - I see what some people do; no WAY am I eating them!