The biggest problem is, there are plenty of copycat cases. I wanted to post one link to a string of cases near a city in Europe (huge time gaps between the killings, attacking couples, certain day of the week, some PM activity, no sexual actions whatsoever but likely, sexual motivation), but i am afraid that even this could be the trigger for somebody. But the ones who can read between the lines....Delphi make me wonder if the killer was copying that European case. The psychological portrait of that alleged killer is interesting.
Bolded by me....
Perhaps an academic question, but how do we know there are plenty of copycat cases? Can we always distinguish copy cats (especially if unapprehended) from a situation where these serial murders are similar just because sexually motivated murderers exhibit predictable patterns of behavior re: fetish/signature development, victimology, etc?