The post by Kimstu, quoted below in its entirety, is significant. PTSD is a real disorder, suffered by some victims of trauma, and certain “trigger” stimuli can cause troublesome flashbacks. The trend to demand “trigger warnings” for every little thing that can be upsetting to one special snowflake or another is a bastardation of the idea, pushed by various special-interest groups as a means of censorship of politically unpopular (in some people’s minds) ideas.
Too Mild for the Pit: I hate Resumes (Jan. 29, 2012) MPSIMS thread. (Started about resumes, got sidetracked into discussion of trigger warnings.)