So you're expecting these people to have the deep knowledge of human psychology to know ahead of time that this is likely to cause them long term PTSD, and the impact that will have on their lives, versus simply something they will get over a month after quitting?
I don’t think it takes any special knowledge of human psychology to understand that horrific images can cause emotional trauma. I think it’s a basic due diligence question that when considering establishing such a position, one should consult literature and professionals to discover what impact there might be and what might be done to minimize it.