Albert,

I don't know a lot about computers, but I think I am correct in saying that even if person A knew person B's IP address, that person A would need the cooperation of person B's internet service provider to determine the precise identity of person B.  I also think I'm correct in saying that such a company would provide such information only to a law enforcement agency, and only if a judge had determined that there was evidence that a crime had been committed.  Therefore it doesn't seem that Mr. Johnson has anything to fear, even IF the webmaster scrutinized IP addresses, which I very much doubt. 

Besides, Mr. Johnson (if he really exists) has freely given his name and the name of his city; he has also (supposedly) given his name, address, and (I would guess) phone number to the Sun Herald, to which he allegedly has submitted a letter to the editor.  In other words, Albert, Mr. Johnson SEEMS to be a "red-blooded American male" (in SFT's famous phrase) who is willing to take a public stance and stand up for his opinions. 

Of course, many of us are beginning to suspect that he doesn't really exist (certainly his letter has yet to appear in the Sun Herald), so maybe your concern for him is ill-founded if he is just a faker, as has been alleged.  Only Mr. Johnson can refute that charge of fakery.