The documentary opens up with an interview with Kuklinski, where he states that if he's mad at you, he'll kill you, and that you'll never get away from him unless you shot him or killed him. He also went on to say `If you didn't kill me, you're stupid.' Through most of the interviews, Kuklinksi never bothers to hold back any facts, and is never hesitant to give any away. He states at one point, he has nothing to lose. I suppose this is most likely why he is so cooperative.