I wonder at times if they become one by conditioning at a very young age, as in infants and toddlers.
I know many of you have seen mothers that has a kid that controls the house. They give them what they want to shut them up. I've seen mothers take something away from one child and give it to the troublemaker,and that kid only grows worse. I see that in Jodi. It's terrible of me, but I wonder if Jodi's mom was the " throws the baby in the bed with a bottle" kind.
The age old argument..nature vs nurture!