Thank you DuckDodgers for trying to explain what I am saying. I feel with the vast misunderstandings that I am failing to properly articulate my point. Let me try again.
I'm not saying that giving an IP address can find a person's Christian name, their exact street address, and the number of goldfish they have. I'm saying that it will give the general location where they live. For the sake of argument, lets say that I gave an IP address from the Greater London area. How many flat-earthers do you know that live around London? Doesn't Thork and Daniel live in or around London? Wasn't Gayer from there? I don't recall specifically, but you can see how the list of possible flat-earthers is substantially lower with this little bit of information. As none of these members have said on the forums that they work for NASA (which would be quite unlikely in London), I would be revealing to the society something about their personal lives. Even if it wasn't against the rules I would still not do it.
Now, what if the NASA IPs are from a smaller metropolitan area? What if it's somewhere we know (or are reasonably assured) only one flat-earther lives? It would be very very easy to match the IP to the user. There are only a few dozen flat-earthers that use these forums and they are spread across the English-speaking world and beyond.
So, as I hope you can now see, I'm not worried about exposing the user's real-life name or address or something like that, I'm concerned about revealing the user's profession to the forums. I hope this clears some things up and everyone can stop arguing this unintentional straw-man.