While I agree with you blighted star that he is probably not schizophrenic, and had drug-induced psychosis when he murdered his family, I also disagree with your statement that if he was indeed a Sociopath he would mess up and be found out. I suggest you read a book called "The Sociopath Next Door". You would be surprised how many Sociopaths live amongst us, working a normal job and living a normal life without detection.