Graphic imagery or discussion of traumatic events can be a legitimate source of emotional distress, not only for those who might have survived or know someone who might have either died or survived such things, but for those who have no intimate knowledge of these things. Seeing the "jumpers" from 9/11 or the emaciated forms of Holocaust survivors can and has produced strong emotional distress in students. These are legitimate "triggers" that would affect a reasonable person. Political speakers who disagree with one's beliefs are not a legitimate cause for distress.
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