Earthnut,
7 months back I finished my read on John Douglas' and mark Olshaker's "The Anatomy of Motive." A book of which I used some of the forensic profiling common data of pshychological symptoms as they relate to their social surroundings of many serial killers and mass murderers. Borrowing that data, I compared it to commonly held views of those physchological factors in play in those who are suicidal (or struggle with ideations). The parallels were striking. Although, they are 'merely' parallels (meaning that parabolically they don't touch) there are shared factors. Anyhow, the purpose of such a comparison was to reach those who tend to not care about being on the lookout for fellow workers who may be suicidal. The aim was this: though the percentage is small - it is nonetheless real that some people who become suicidal are not only a danger to themselves - but to others when they also become homicidal. Murder suicides are known to take place."
I 'enjoyed' reading up on the listing. Very cruesome . . . and scary. Bundy is correct (I'm afraid) that there are others out there that haven't been detected.