I'm not going to express an opinion one way or the other here, because I think I can see both sides and haven't made my mind up yet, but there is one pertinent question I think I have to ask:
merlyn, let's suppose this becomes quite regular, and you generate your list on a regular basis. And let's say it does get whittled down to one or two suspects. (Big ifs, I think, especially since you assume it's the same people doing it regularly, which may or may not be the case).
What happens then? Do you publish their names on your home node? Do you set up a list of "Merlyn's Most Wanted"? (Although, that would be a giggle :)
Also, what is going to constitute proof? How many times do you have to see their names? As I see it, you never have anything more than circumstantial evidence, which could inflame opinion (as it obviously is doing) if you ever did publish a list of the culprits.