how is kreizler his own worst enemy

Kreizler is a little paranoid and aloof. Kreizler learns about the murder of Giorgio Santorelli and comes to believe he is the latest in a string of serial killings. This inspires Kreizler to use some new thoughts in psychology to help create a picture of the killer in order to catch him. Kreizler's style of psychology is not widely accepted, however, causing his involvement in the case to be kept secret in order to protect the police department and Theordore Roosevelt's job. This does not stop some local business men from learning of Kreizler's investigation, however, and striving to stop it.