Train conductors have had to step down from lifelong careers due to the trauma of being a part of a train suicide. Others continue but have PTSD. It sticks with them. I remember seeing a video talking about it a very long time ago and I remember one of the drivers saying something along the lines of "if you see someone step onto the tracks, you close your eyes and plug your ears and wait until the train stops because there is nothing else you can do". I can confidently say as someone who has been suicidal for over a decade that if I were a train conductor and was the one driving a train that someone used to CTB I would be traumatized for life. I do not wish to be the reason someone dies, suicide or not. Accident or not. My fault or not. So while you may say you wouldn't be traumatized, that does not make it not traumatic for most people.
And I'm a firm believer that ending your own pain should not involve an unwilling participant. Someone who did not consent to assist you in dying should not be put in a situation where they unwillingly kill someone.
