We are discussing classic novels, not the showing of graphic pictures of foetuses, murder victims, mutilated animals etc.
I agree these could be distressing, especially for those who have had experience of these events personally.
Don't do medicine, become a pathologist, forensic scientist, social worker, police officer - that would be sensible.
But if a student doesn't realise that some classic literature does contain descriptions deaths, exexcutions, politically incorrect (by today's standards) events such as young girls aspiring to meet the military - always an officer, never a private ?, then perhaps they are taking the wrong course.