[CatDawg]

In my opinion, some serial killers are crazy and some are not.( This is coming from a person who used to check out library books on serial killers at a young age-what was I thinking? I still read and watch everything I can today-but mostly fiction stuff now) I think people who become serial killers have a mixture of genetics (nature) and environment (nurture) that cause them to become who they are. Some are born to become serial killers and some become serial killers through circumstances such as serverely abusive parents most likely the mother being the abusive one. You will find throughout history or by reading books on serial killers that many serial killers confessed to being very aware of what they were doing and knew it was wrong but really enjoyed doing it mostly for sexual satisfaction or thrill. They become addicted to the thrill and do it over and over again. You will also find that there are some who are psychotic/schizophrenic/some type of personality disorder/other mental illness....

In reference to serial killers being smart, most are...do some research and you will find that many have above average intelligence, have good jobs, and are good looking.
serial killers arent usually a product of snapping under pressure. This is something that have been doing for a long time usually beginning in childhood and their acts are usually well though out.
This is just my opinion... Hope it helps some...

You hit the nail on the head BGG. Most everyone has an addiction some smoke, dip, drink, crime, etc for a serial killer it is usually for sexual and or torture reasons. That's where they get their rush.