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Part of being charming is being an exceptionally good actor. They know what sane is, and they know how to act it if need be, and if it suits their purpose.
Yep. And that same protective coloration lets them manipulate and con others to an amazing degree. They know, or can calculate, what you want them to say; they have no compunction about saying it, whatever it is. That's one reason they're difficult to test with any validity.
Everyone reading this has probably known a psychopath, without realizing it at the time - possibly never realizing it.
The other thing to remember is that the vast majority of psychopaths are not violent criminals. They're conniving bastards, but if it's easy to get their way legally, why not? There's no compulsion to break laws - just no restraint against it, either. Law, politics, business are all perfectly legitimate undertakings where they can shine with their superb gamesmanship.