Safe Spaces? Trigger Warnings?

I’ve been fascinated by the dust storm kicked up by the letter that the Dean of Students at the University of Chicago sent out at the start of the school year, essentially telling students that Chicago “doesn’t do” trigger warnings or safe spaces. To my mind it’s only common courtesy (and common sense) to suggest that a topic about to be introduced is going to be difficult. This is different than a broad statement on a syllabus that “warns” that issues of “capitalism, racism, sexism” (etc, etc.) will be covered in the course – which neither prepares students for the discussion nor serves any concrete purpose other than acting as a kind of product liability statement. What do you think and how do you handle such issues in your classes? Please comment!