the experts mean that majority of serial killers had at least one to possibly all three and that they peed the bed after a certain age

The experts don't even know why causes a person to snap and become a serial killer. I think it is rather limited to say if they pee the bed at a later age that they will go on to be a serial killer.

Hmm. Some people are just plain dam nasty.

Suppression of emotions I think plays a major factor in violence. People stuff their feelings inside, don't let them out, and finally blow up over stupid sh*t. Not just acting aggressive, but even getting violent.

Childhood outcasts have a tendency for violence in adulthood. Not feeling like a part of any team, thinking everyone hates you..

Also, if you live in a community where bigotry is widely accepted, I think you have a higher probability of having more anger issues than the person next to you.

Ah, I don't know. Lotsa sh*t tied up with this question, for sure

I agree but I do believe if people looked at the whole picture,a pattern will emerge some where in that persons life who committed the crimes

The problem with serial killers is there is no pattern, some are brought up in rough households (Manson, Gein) all the way to a "normal" upbringing (Bundy, Dahmer). Really there is no set pattern or reason, it is a difficult thing to say the least.