It's just a test of power. Can they push absurd notions and get most people to go along with it, or is their power not that significant yet. This is why they never stop pushing the envelope ie why the slippery slope concept is not a fallacy in such regards. They do more testing and then analyze the results. They try to figure out what in particular caused people to suddenly resist and then they try to find a way around that psychological mechanism and/or a way to exploit it. People typically misunderstand psychopaths and think the psychos have some longterm master plan. The psychos are just bored and only experience the thrill of life through power. Power for the sake of power unto itself. Then they get bored again and push the envelope some more to see what next level they can reach and get away with it.