OP again--this wasn't just a question of personal opinions on my part--it was also a concern about viewing this kind of content on my work computer. I can't risk having it come up again. Of course it could be argued I shouldn't be on FB on work... but it I wanted to check it on my lunch hour, I would like to feel I could without crossing a line... and I am a member of a professional group on FB.
and yes, to reiterate, if this had been someone I had spoken to in person in the past decade or had any other social ties to I probably would not have taken such an extreme action. But while we were close in high school, (15 years ago) we haven't been since, don't have any current friends in common, live thousands of miles away from each other, my parents moved so I never even return to our formerly shared hometown, and I actually don't keep in touch except through FB with anyone else from HS either.