From http://180rule.com/psychopaths-are-opportunists/ (bolding added):
“The psychopath’s [defect] may seem a disadvantage, but in a 180 degree maneuver, he uses it as part of a pity ploy, asking people to make exceptions for his disability –and nice people do. They expect gratitude but they will get the opposite. He will use this favor, that you did for him, to slide into your circle of trust. From there he might offer to work on your aircraft or car to show his appreciation. He’ll make you feel safe. Then he’ll sabotage you. Ted Bundy used a fake cast, but this psychopath uses his real disabilities. It doesn’t matter if it’s real or fake, since they both work equally well, in the pity ploy.
I’ve noticed that psychopaths rarely have just one goal. They layer their goals. The first step is always to gather minions who will do their bidding. Whether the psychopath wants sex, money, power or just needs drama, he will bring his players together like a conductor at a symphony.
They usually also plan an exit strategy, but it’s not very well planned because they don’t think they will lose.”