Because it is.
I'm not trying to gaslight you, insofar as reason itself agrees with my proposition.
There's a good way and a bad way to have elements in entertainment. Using the "black man" example again, a good example are the Redguards in The Elder Scrolls games. I wasn't annoyed, the Redguards were a natural and very good part of the world building and lore and served to better entertain me.
A bad example on the other hand is literally any of the "obligatory black man" now seen everywhere. He doesn't serve any purpose other than to say that there's a black man.
I want more Redguards in my entertainment, not obligatory black men.
But! If I am like a techno-angel sent from the Heavens above, then what I can do is suggest to you that exit, as opposed to voice, is a sociopolitical act that you should consider. Exit from the mainstream culture is your best bet.
This also only means that any sociopolitical exit from the zombie invasion must at least be as high as considering a departure from common epistemology.
They were just examples, I'm deeply annoyed at anything concerning acute political/social activism in entertainment because it's simply not what I wanted to spend my leisure time on.