When we start writing, everything is purely biographical. We write about what we know, what we see, what we feel, what we experience.
Each of the characters we write about is a mini-us. Songwriters begin as puppeteers, and the singers we write for are the hand puppets mouthing the sentiments we wish to spout, the words that best express our opinions and life experiences.
These experiences and opinions define us, become our grandstand, our soapbox, our catharsis. We express ourselves with little care for whether our writing is accessible to our listeners.
We are in fact so caught up in our self-absorption, that we believe with all our hearts that everyone who hears what we have to say will be drawn into it, fascinated by it, uplifted by it, taught by it.