Personality of a killer: church-going, jolly family man

How can you tell who will become a killer?

The answer is surprising in the case of the man suspected of sending anthrax powder in the US mail in 2001.
http://www.nytimes.com/2008/08/02/us/02scientist.html?em#
New York Times
By SARAH ABRUZZESE and ERIC LIPTON
August 2, 2008
FREDERICK, Md. — Bruce E. Ivins arrived last month for a group counseling session at a psychiatric center here in his hometown with a startling announcement: Facing the prospect of murder charges, he had bought a bulletproof vest and a gun as he contemplated killing his co-workers at the nearby Army research laboratory...

To some of his longtime colleagues and neighbors, it was a startling and inexplicable turn of events for a churchgoing, family-oriented germ researcher known for his jolly disposition — the guy who did a juggling act at community events and composed satiric ballads he played on guitar or piano to departing co-workers.

“He did not seem to have any particular grudges or idiosyncrasies,” said Kenneth W. Hedlund, a retired physician who once worked alongside Dr. Ivins at the Army Medical Research Institute of Infectious Diseases in Frederick. “He was the last person you would have suspected to be involved in something like this.”