I hear what you're saying--and it makes sense to contact the fellow through the police and get him to lay off. But.... I have some misgivings. Basically they are as follows:
First, it would be contrary to the accepted wisdom, such as it is, encapsulated in the book The Gift of Fear by Gavin de Becker, who deals with this precise type of situation in a chapter entitled, suitably enough, "Persistence, Persistence." I don't recall if I mentioned this book before--I've been corresponding with a bunch of people so I forget.
Secondly, this is New York City so it is hard to get the police to deal with such situations. But even if I do, according to deBecker such contacts actually make such things worse.
Is anyone out there familiar with deBecker's book? It is really quite good, and also jibes with the advice that I received, separately, from a psychologist a few years ago.
Anyway, I am still wrestling with the thing and have not ruled anything out.
By the way, if you think this is bad, he accused my former boss of taking a $3 million bribe and he accused another former boss of being in league with criminals.
His accusations are so wild that nobody takes them seriously. He accused me in one recent letter--I just got a copy of it today--of "covering up" for serial murders, rapes and narcotics trafficking.
I am less worried about the letters than I am about him turning violent. The letters just make him look nuts.