This looks like a hunt for culprits, even if such course of action does not make much sense. Please be aware that these are suicides, not murders. The workers, even the suicidal ones, are free and self-responsible people, presumed to be capable of taking care of themselves and their life, which includes their physical and mental health. Here's a dull, yet important word of advice for everyone: be aware and caring of yourself as a living person and don't hesitate to change course if your current path leads to misery of any kind, let alone to (premature) death.