One thing that needs to be taken into account is that this being a fictional series, deliberate steps have been taken to obscure the who-represents-who. While it does bravely take on a lot of present-day controversies, it is not trying to be a mirror of the present day, it is trying to be a work of fiction. This deliberate obscuring of symbolism allows the show to appeal to broader audience, and thus make more money for its creators.
Yes, money.