Trigger warnings are fundamentally about empathy. They are a polite plea for more openness, not less; for more truth, not less. They allow taboo topics and the experience of hurt and pain, often by marginalised people, to be spoken of frankly. They are the opposite of censorship.
http://www.newstatesman.com/culture/201 ... r-warnings
[I recommend skipping the comments. Mostly of the form "Of course there should be more empathy. As long as we don't have to change how we have always done things."]