That they are not responsible for the outcomes of their evil. That fundamentally affects their insight and their ability to predict failure. It's a built in boobytrap.
Unfortunately, the damage that they do is so pervasive and difficult to mitigate (because so many are easily conned by them) that the damage is already done before they blow their cover. Or have their evil games stopped by drastic measures.
Characteristics of Psychopaths
1. Aggressive, callous, and cunning
2. Complete absence of conscience and empathy
3. Very adept at manipulating others
4. Willingness to engage in immoral, criminal conduct
5. Willingness to take what they want and do as they please, regardless of who is hurt or wronged
6. Deceptive ability to appear outwardly benevolent
7. Deceptive ability to behave in superficially charming ways to hide purely selfish motives
8. Willingness to use intimidation and violence to control others in order to satisfy their own needs
9. Willingness to intentionally violate the basic inherent human rights of others
10. Complete absence of any sense of guilt or remorse for the harm their actions have caused to others
11. Rationalization of their own immoral behavior
12. Will attempt to lay blame upon someone else for their own conduct
13. Denial, will deny their own wrongdoing outright
14. Utter contemptuousness toward the feelings and desires of their fellow beings
15. Pathological lying, will say anything without any concern for truth to advance their own hidden agendas
16. Ablity to feign [fake] normal human emotions and empathy
17. Distorted sense of the consequences of their actions
18. Total failure to accept any responsibility for their own socially irresponsible ways
19. Strong bellef that they will never be brought to justice for their criminal behavior
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