of course I don't pretend to know him, and I even don't pretend to "judge" him.
I only try to make links between some interviews, facts writen in some books, facts relied by other persons, etc... that's all, and I think most of us do the same.
I love his music, but I see him as a human person with good and bad sides, like all people.
That's why I don't always like the "fan" point of view which says he was always right and other were always wrong (like with David or later with other members).
I just wanted to say that of course nothing is black or white, and recent posts had focused on the fact that David may have regreted his "choice" to leave the band. My opinion is that, maybe, he didn't have really the choice, but that's only speculation, and by saying that I am not judging Mark.