Yes.
IMO people who premeditate a murder are not hard wired like normal people with a conscience. They also usually think they are superior in intelligence and can run circles around the rest of us and so good looking that we will fall under their spell. They think they can plan the perfect murder and fall back on their irresistible charm if in a jam.
I wonder how much they were spoiled as children? Always getting their way? Being the center of attention? Never having to work to get what they want? Never learning to share? Never being denied or hearing the word 'no'?
I wonder how many spoilt brats grow up to be self entitled, ill equipped adults like Casey Anthony, Jodi Arias and Brett Seacat.