To further muddy things, you should know that explosions themselves don't produce the responses they do just in veterans. High-bandwidth sounds trigger an autonomic response as soon as they hit the brain stem- long before the cortex has a chance to think "I recognize that as an explosion", the brain stem said "HOLY SHIT SOMETHING IS HAPPENING". This mechanism is observed in rape and abuse survivors as well as veterans.
I'm all for being courteous, I just have serious concerns about giving college students the impression that the world around them needs to adjust to them rather than vice versa.
Showing pictures of a massacre
Showing pictures or video from a war
Reading a graphic account of a soldier from war
Showing pictures of mass graves (esp where body parts are identifiable)
Showing pictures or video of a rape (even if a scene from a movie)
Showing pictures of the evidence from a rape
Reading a graphic account of a rape victim
By not making a policy, but encouraging a culture of learning about common triggers, we also encourage a more adaptive approach. If someone is distressed and they let you know, you can decide whether it makes sense to warn about that content in the future.
Now we watch Bachelor in Paradise. I'm not sure it's an advancement.