NPD and other associated PDs are the only MH conditions where it is the sane person involved in the lives of these people, are the ones who seek help.
This is because being involved with people with NPD damages your MH. It strips you of self-confidence, causes anxiety and depression and can lead to othe rhealth conditions in the long term.
Those with NPD, however, refuse or don't seek help because they think there is absolutely nothing wahtsoever wrong with them. It is everyone else that makes their lives complicated by not doing everything they want all the time! They also tend to be able to hide under such a charming persona that other people are completely taken in by them and they then believe you are the person who's nuts!
All of us have narcissistic tendencies within us, but people with NPD are a whole different ball game. Only when the differences are recognised will any real recognition of just how destructive this condition is happen and begin to help those who have suffered as a consequence of knowing or being related to, someone with NPD. Only if you have been intimately involved with these people will you know the difference.