Masters of Manipulation
More than any other character trait, it is the Predator's skills at manipulation that enable him to perpetrate for so long, creating so many victims. Though sociopaths are skilled at manipulation, Predators take it to an entirely different level... a much deeper and darker level.
For the Predator, manipulation is part of the thrill of the hunt, not just a means to an end. That dark motivation must be properly understood, if one is going to be able to properly identify a them.