@dlowan,
Well, me, I've been following italian history and culture (yes, the glorious, the good, the bad, the ugly) since at least the mid eighties. My interest in it underpins my then growing interest (not that it was ever really absent) in much more of world history, culture, and so on - and besides history, anecdotes old and new. Interest in this is a natural for me - and besides that, I like Perugia, from my too short time there.
For others, some relate to Meredith Kercher and are interested in how she was murdered, there being no denial on anyone's part that she was.
For some, it's the legal process aspects.. this being the heart of much of the heat.
For some, it's trying to work out a puzzle of many parts.
For some, it's relating to what can happen when one goes off to study far from home, on either or both sides of the issues here.