'Narcissistic personality disorder (NPD) is a personality disorder in which there is a long-term pattern of abnormal behavior characterized by exaggerated feelings of self-importance, an excessive need for admiration, and a lack of understanding of others' feelings. People affected by it often spend a lot of time thinking about achieving power or success, or about their appearance. They often take advantage of the people around them. The behavior typically begins by early adulthood, and occurs across a variety of situations.
Narcissism is not the problem; the abuse is. Whether alcoholism, chronic pain, loneliness, or severe narcissism causes the abuse is not our immediate concern. Some lines should not be crossed no matter what drives people over them. Our priority is protecting ourselves.
I was hugely struck by the narcissism of Andi Dier on their twitter page when ai looked at it after the Rose McGowan stuff kicked off. This was a person who'd stood up and heckled a rape victim and their whole twitter feed was
I think it's a bit of a sticky subject Mum - if one focuses too heavily on the reasons for the behaviour it can look like one is trying to make a bogeyman of a whole group of people. You won't change the people behind it either way, so in my view best focus on addressing their impact.