Being mentally impaired due to his situation, he wasn't in a position to decide what was best for him or anyone else. His doctor or immediate supervisor should have been more vigilant and should have declared him unfit for that particular duty. Anyway, blaming this one guy and shutting the case is ignoring the potential hazard of emotionally volatile people in sensitive jobs. I hope they take appropriate measures and make the necessary reforms to avoid repeating history. Most importantly, drugs should not be prescribed to people working under pressure to make them perform better. Find a suitable candidate who can handle the job.If he felt the way he describes he should have quit his job and moved on to something else.