However, when someone truly 'knows not what they do,' they don't go to great extremes to hide it from others.
This is something I try to keep in mind also.
People with a personality disorder have acted a certain way for so long that it has become part of who they are and I have to agree here that when you bring some of their behaviours up to them, they genuinely might be completely baffled by it and even think that whatever is going on is your problem.
If they’ve been the way they are for their entire life and nobody has called them on it and suddenly you do, they truly don’t understand nor even care. In fact, they wouldn’t even know what narcissism even is so certainly wouldn’t recognize it in themselves.
This is something I have tried to keep in mind.
For instance people who were raised during the war or days of the depression, may carry a mentality of ‘waste not, want not,’ to the point of being hoarders and/or being incredibly frugal. It becomes a habit to always make sure they are getting the best deal in any situation regardless of whether you are a friend or family member. Pointing this type of behaviour out to them will only be considered rude on your part and if they are close family members, rest assured, you WILL be taken advantage of since it IS a ‘built in’ part of their personality.
It might take a lifetime for you to recognize and figure this out, leaving those that are close to them frustrated and scornful but in the end, they are just being themselves and don’t consider their behaviour harmful.
Your last statement certainly rings true in my life experience and is something to keep in mind.
It’s almost impossible getting an apology from these types of people since they will never acknowledge any wrong doings on their part but could make a long list of yours.