Does this apply only to men interested in molesting children, or would it be considered legitimate personal expression if I was to write a nice ("literary" of course) piece detailing my own personal fantasy of removing Mr. Sharpe's genitals with a blunt instrument and forcibly inserting them into his digestive tract?
Very probably. Read "American Psycho" by Ellis. You should of course remember all standard disclaimers about any similarity to real, live persons being strictly coincidental.