"There's the real life Mark, the one that couldn't go to medical school, couldn't find a way to be as successful as his brothers, that felt low self-esteem and probably very bad about himself that he couldn't be who he wanted to be," she says. "And then the desired Mark who was going to medical school, who loved his wife, who loved his mother-in-law, who loved his family. So as long as he could portray himself as the desired Mark, he was, in fact, lovable and happy and perhaps not murderous."
"When that was no longer an option, that's what triggered the terror and the rage. And so in that moment of terror and rage in order to regain back control, they become murderous."