I think the point is that to some people, having an extremely flattering view of them put forth is less important than having an accurate view.
In part, that may be because people assume if their reasoning is exposed then the public would be with them, so that's flattering enough. (Logically, it's not possible the public would always agree, because otherwise we would never have disagreements).
I think the Social Network, for example, is quite accurate about the most important things (the zeitgeist of how a startup like Facebook comes about .. the energy, the betrayals (both perceived and real), the craziness, the attitude of great founders etc).
This is a movie and not a documentary .. for my money I expect the Director to put his creative efforts into making something enjoyable to watch. As long as it's not a blatant fabrication, fact for fact historical accuracy isn't why I'm going to watch this movie.
Aaron Sorkin viewed Zuck & co as a vehicle to tell a larger (and more important) story about modern culture .. if The Fifth Estate accomplishes the same, it will be a great movie.
In part, that may be because people assume if their reasoning is exposed then the public would be with them, so that's flattering enough. (Logically, it's not possible the public would always agree, because otherwise we would never have disagreements).