Imagine a problem that affects the sexes differently but which is only visible long after the fact, like an environmental contamination or a disease outbreak or a combo of things. Maybe women who lived near a chemical plant all dropped dead of Alzheimers at age 50. Maybe men who received a certain medication and also caught chicken pox all went sterile. Maybe it only shows up in number crunching after the fact. Maybe it happened so long ago that there's no-one around to ask any more. If self-ID overwrites birth records, those problems are invisible.
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