Suicide is a verb and result by itself. Would the author also say “he died by murder”?
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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.