Is there any book anywhere that couldn't be in need of a trigger warning? Think about Twilight or Lord of the Rings or The Great Gatsby. What would be helpful is for professors to do what many I know already do: ask students at the beginning of a class to inform them privately if they have any issues that might interfere with classroom learning and proceed from there.
What strikes me about many of the responses to my piece on trigger warnings is that much of it focuses on whether trigger warnings are a good idea or simply another way to coddle students. The fact that the discussion seems to be stuck on this particular axis suggests to me that perhaps I did not make my own thesis clear.