They are metastatic cancer of the intellect/personality.
Please read “Stop Teaching Our Kids to Kill” by Dave Grossman. (http://www.killology.com/book_stop_summary.htm
I struggle every day with the effects on my (now 27 year-old) son of 15 years of Operant Conditioning from increasingly violent video games. I rue the day I ever brought the 1st Nintendo home.
Media violence destroys lives!!! (http://www.killology.com/new_media_vio.htm)
Interesting links. Have you read Richard Rhodes book “Why They Kill?” which was about the theories of Criminologist Lonnie Athens? Athens detailed the creation of violent criminals through a process of “violentization”, and what you posted may certianly apply.