Only fifty percent of photography is about cameras, film and chemicals. (Maybe even less.)
At least half of photography is about the mind of the photographer, what he thinks and how he perceives the world he makes photographs of.
Just criticism or not, studying and discussing a photographer's (or a writer's) personal life is just as important as studying his photographs or the methods he uses to make them.
Provided we observe the caveat; the person being discussed is not present to defend himself; discussing his reported behavior is not out of line.
We just need to keep the discussion on an academic level, not a personal level.