To deal with the question ‘do psychopaths understand these are generally psychopaths?’ we need to keep ideas that are several brain.
The very first is that psychopaths are expert liars. They make their living manipulating other people and another part of that is for them to tell the truth that they are great liars, often lying even when it would be better. That they will answer truthfully if you ask them a question, you cannot trust.
Another idea is the fact that the amount of intelligence differs, you can find clever psychopaths and there may be others who’re perhaps not therefore clever. They’re not all stupid simply as they are psychopaths.