Galvino, I had similar thoughts from about the age of 12 to young adulthood sometimes, for absolutely no reason really, just because life was very frustrating for me at times and I may not have had a tremendous amount of understanding or support from my family, although they are actually a great family. I've heard it's common for people to have those thoughts actually, a lot of it has to do with hormones, etc. Or of course some young people have very good reason to have feelings like that. I agree, there certainly are some people, for a variety of reasons, physical (i.e. frontal lobe damage or many, many other possible physical causes), metabolic, emotional, psychological, who are not equipped with the self-restraint to prevent them from actually acting on irrational or angry thoughts like that. What you describe is certainly one possibility in this case, but it seems odd that it would have taken this long really, I mean, at this stage KC finally was taking the first steps toward being out on her own, etc. She could easily have left Caylee temporarily or permanently with her parents to make it easier on herself and be or do whatever she wanted, while at the same time continuing to have as much contact with Caylee as ever. I guess I still have difficulty really seeing any motive for premeditated murder or a fit of rage kind of murder.
I can't rule out KC harming Caylee, but I think that's just one very slim possibility. What about the number of people she and Caylee were around in the time frame? I read recently that a study in family courts showed that a child is 50x more likely to die of inflicted injuries when its mother lives with one other adult (who is not the biological father or grandparent). That's in cases with a mother having just one other roommate. What about a case where a mother was around THIS many other young people with the child...several roommates at each address and other people coming and going. No accusation of any individual, all are presumed innocent of course.
I find it much more likely that an accident occurred during KC's or any of her friend's watch, or that someone took Caylee. KC could be wrong about who took her, she could have believed something someone told her, who knows. Excuse my rambling