Is that really a reasonable request in a literature class? Does the same apply to any traumatic event and any field of study -- for example, if a medical student was robbed at knifepoint, should he be given advance warning about seeing blood or cut skin...?
The quoted passage specifically mentions "people of color or students from a low-income background" in addition to survivors. How is that meant to be interpreted? What kind of writing do poor students need to be protected against?