it’s a dogwhistle. they’re implying that trans people are mentally ill and that the postal worker is a victim of inaction with or indulgence in the trans population.

It’s the same reason why all the chuds started banging out about how violent trans people are when that trans man (if i remember correctly) shot up a school a year or so ago.

despite the fact that the overwhelming amount of school shooters are cis right wing incels