Deep dark secret at USPS is they have a large number of black employees. They always have had. It is the most integrated large institution in the nation ~ and every single one of them has a perfect track record when it comes to obeying the law.
No felons need apply. Too many speeding tickets can get you removed as well.
Your problem is YOUR problem.
My older dog has demonstrated to me the racist reactions of much of the local citizenry as I walk her on a short leash downtown and many step back on seeing her wearing her friendly (Lab) black fur with BIG white teeth demeanor as she marches on. Pretty funny really.
Apparently the same racist folks have finally rising in the USPS seniority ranks to get the walking routes. It's really pure dog racism.