The universal question to ask when you see the man in question and then see his wife (Huma Abedin): why on earth would he risk losing that?
Strangely enough, mental health professionals are working on an answer. The American Psychiatric Association will soon publish DSM-V (Diagnostic and Statistical Manual, Fifth Edition). One of the proposed changes, though I don't know whether the committee in charge made the change, is the addition of "self-destructive personality disorder". Personality disorders are probably the most controversial set of mental illnesses, and the APA has been shy about defining new ones since 1985 or so. Weiner is not really a good example; one of the classic examples was a lawyer of my acquanitance who rose, literally, to the presidency of the state bar association. This was unusual for a family (divorce) lawyer. He had, in fact, written "the book" about divorces in our state, which included, in the "ethics" section a very strong condemnation of having any kind of relationship with a client, and never-ever-ever to **82** with clients.
In the late 1990s it came to light that while he was state bar president, he took to administering a brief psychological test to new clients which, among other things, revealed sexual vulnerability, and he had taken to maintaining a small harem of women including one whom he enjoyed screwing in various semi-public places in the local county courthouse. The irony was, as near as the evidence indicated, he never had an affair with a non-client.