A reviewer assumed a screenwriter/director was driven by anger to make a work, but being driven by this emotion seems a stretch too far. How does one manage that emotion while working with it? Wouldn’t anger get out of control and interfere with the person doing the work, effectively disabling the person from thinking straight?
I guess anger in writing can smolder underneath, under layers one has built up to protect oneself from exposing the driving, motivating force behind a work or works.
The problem with writing in anger is that anger may be seen in how one treats the subject they are irritated about. An exaggerated treatment may reveal a bias towards a certain institution, but it isn’t the way it is. This is when things become unfair.
I think it is best to avoid those writings that are driven by the emotion of anger. There are other emotions to write with, and these can be negative ones. For me at least, anger is detrimental to getting on doing the work properly.
In the end one may be misrepresenting something or some group entirely and perhaps regret doing so afterwards.