The charm psychopaths exhibit is all part of an elaborate act. They are experts at imitation and impression management. They spend their entire lives watching people, mimicking and mirroring them, and then they use that knowledge to exploit others in order to get what they want.
One thing is certain...they do NOT feel bad about anything! They do not feel guilt or remorse, because they DO NOT CARE. And they come back around and hoover targets back in because they want to use others and have power over them.
Everything is a game, and they need to win. So the hoovering is about control. They view their targets as objects, as toys that they are not done with yet. It's highly entertaining for them to pick up a "toy," play with it, and throw it down, over and over and over again, until the toy is destroyed.