I don't think it's petty at all to link to publicly available information, when others have requested that information. Google-fu differs between individuals.
I do find it particularly petty that someone would go to great lengths to expose the private details of the life of a man who just wants to be left in peace.
All I have done is link to some items that she released into the public domain on a previous occasion.
Sharing the stupidity of others is a long-lived internet tradition. It's almost adage status; be careful what you post, it may come back to haunt you later. The same is true of this, I suppose.
I, for one, am quite interested to know more about Satoshi Nakamoto and this article is responsive to my curiosity about him. As someone else has pointed out, a great deal of information is public anyway in the form of property tax records and what not. If this were not the case I would get much less direct mail.