When I read this article I could see so many of these traits in my father, my older sister and my husband.
My attempts to point out "truths and realities" had served to only end up hurting me even more. Individuals with these traits DON'T WANT TO LISTEN, just as it describes in the article.
This is why writing that letter to them defining how they hurt you will not really be respected. The only "truth" an individual like this will see is in fact "their own truth". If you can't be with them, then you are against them. That means a letter shedding light on their true problems is never going to be respected.
I DO think there is a spectrum to this as well, as some are worse than others. The thing is, often these individuals do have talents and abilities. This is why they often accomplish their coveted leadership positions.