I disagree. I don't think he pre-planned to kill the children. I think he killed them because they witnessed the murder of their mother. If he had pre-planned all the murders, he would have chosen another time when he wasn't expected at work and he would have used her car to dispose of the bodies. JMOHe didn’t really lose control per se. He planned these acts. He planned to kill his family and he did. This wasn’t a sudden act of rage no matter how bad his family and his adoring supporters want to think it was.