Draw on the best of the way the world is and has been, as well as your most optimistic hopes for what it could be. The real world is very unfair to those on the margins. Use your writing to make up for it.
You're operating by improv theater rules, where as soon as a character introduces a new idea, you say "yes, and" to it. But this theater troupe answers to your direction.
Being blocked on writing that one is obligated to do is something we don't usually think about the way we think about being blocked on creative projects.
The question underneath your question is: "Am I allowed as a commercial writer to do the thing I want to do as an artist?"