In College and Hiding from Scary Ideas
It wasn't so long ago that "trigger warning" wasn't even a common phrase.  I remember thinking about this in college, though, because I was in a relationship with someone who would get angry at people for expressing input that was too closely related to recent private trauma she had been through.  I didn't really understand it because I had always trained myself to judge the producer of input by the intent of the producer, rather than by how it affected me (an effect the producer would have had no way of knowing ahead of time).  It should always be fine for an affected person to remove themselves from a situation that feels unsafe to them, but it shouldn't necessarily mean additional regulation.I am totally in support of educating people to speak sensitively in the sense of it meaning not to speak flippantly or hurtfully about charged subjects - for instance, I will still object to jokes about prison rape - but for it to progress to the point of avoiding provocative subjects entirely, that just seems like anti-progress and willful ignorance.