This trend for commenting on news articles with nothing to say but a complaint about the wording of the headline is tedious. The right to free speech does not impose a responsibility to say something about everything you see.
In this case, these people were driven to suicide. I would argue that those responsible for the Horizon scandal are guilty of at minimum manslaughter of these poor people.
I agree that the wording isn't ideal, and I agree that the headline fails to capture the nuance of the circumstances that lead to suicide, but I disagree that subeditors who write headlines need to encapsulate that nuance. That's what the article is for.