What was the leading psychology behind Jack the Ripper?

Answer 1

In his letters, the shows that characteristic for not following straight lines. This characteristic was shown by the Son of Sam and other serial killers. Each victim was posed in a sexually degrading position, intentionally left that way so the discovery of the bodies would startle the people who found them. They were not concealed or hidden away, but placed in locations where they would be easily discovered. The placing of the victims on their back, grotesquely laid out with their throats cut and viscera exposed or missing, reflect the cruel reality of the killer, his total mastery over their bodies. The pleasure for the killer was demonstrating each victims vulnerability.