As close to a trigger warning as I'll go: "If you are not disturbed at some point in this class, you have not been paying enough attention."
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I agree fragility isn't useful. But I'm not sure that being clear grapples w/ subjects that are personal for some students and not others.
The strong examples in favor of TW I have seen all involve teachers "ambushing" students with materials. I think that's bad, obviously.