Advocates for the use of trigger warnings suggest that they can help people avoid or emotionally prepare for encountering content related to a past trauma. But trigger warnings may not fulfill either of these functions, according to an analysis published in Clinical Psychological Science.
Yes, but if nobody is paying attention to them, then why bother?
I pay attention to them.
The people who need them, generally are more likely to notice them.
Unfortunately they get overused a lot, as well as poorly used, when they are.