@runswimyoga: It’s entirely possible that there are students who either have not registered their disability with the school or who do not have the medical recommendation to support them. I’m frankly not sure why we should protect the former–they haven’t done anything to protect themselves. The latter is a more compelling case.
However, you have to weigh the risks to the latter group against the purpose of education. By the time controversial subjects are coming up in school, the students are generally in high school or college. At this point, education is a lot more geared towards teaching students what they’ll need in life rather than teaching them what they’ll need the next year in school. Real life doesn’t come with trigger warnings or (broad) “safe spaces.”
The danger of not preparing students generally for something that will almost certainly happen, and which training is fundamental to the purpose of the institution, all to accommodate a fraction of a minority of students (that may or may not even exist in the given classroom) is a tough sell. We send students to these places to try real life with safety nets, because it not too long they’ll be playing for real. The danger of actually coddling them simply outweighs the potential benefit of maybe protecting a few students that fell through the cracks.