There were also parts of it that could easily be interpreted as Jim Crow era politics. Passing was a thing for Blacks as well. Splitting into two different cities reminded me of both redlining and "separate but equal." Of course, history repeats itself, and this allegory could also be applied to Jews, Native Americans, and any other persecuted minority, including gay and trans people. Una's whole situation could pretty easily be mapped onto a "don't ask, don't tell" situation as well.

Seems that captains of the Enterprise breaking the Prime Directive is a very old tradition indeed.