This kinda reminds me of a roundtable discussion I read involving a lot of comic book writers who observed that actually, if the average superhero gets his mask ripped off by a villain, it won't compromise his identity; it's unlikely that anyone will recognize him. I thought I knew the Nixon cabinet pretty well, and I never heard of this guy.
Personally, I was fond of the theory Haldeman floated in his book, that it was Al Haig --- a theory so crazy that it just might be true. Only it turns out ... not so much.
In fact, it seems that all the cool kids had already guessed, and I was too out of touch to know it. Timothy Noah, for instance, says I told you so. At least I know that Sir William Gull was Jack the Ripper, so I'm not completely clueless.
And if you're wondering what the heck I'm talking about, Wikipedia, as usual, explains.