The problem isn't who, exactly, was on the list - and what their HIV status might be.
The problem is the PERCEPTION in the general public about what the HIV status must be of people on that list. My guess is that a vast majority of people would assume that they are all HIV sufferers...that's incorrect, but that's what they'll assume.
At least one person who replied right here on Slashdot is advocating that the names of people with HIV should be public knowledge.
So - what is the intersection of people who (stupidly) think the names should be made public and people who (stupidly) assume that everyone on the list has HIV? I think we all know that this is hardly an empty set!
Hence it is very likely that people who DON'T have HIV will be publically identified as people who DO have HIV...and the consequences of THAT can be fairly extreme, both to interpersonal relationship - and (in some places) to getting a job, getting health care coverage, etc.
Also, it's really trivial to find someone's name from their email address - and to find their street address from those pieces of information.
So, no, this is not the small matter you're describing...it's potentially devastating.