Simplification is a human defense mechanism. We gravitate towards stories with clear-cut characters, predictable storylines, and uplifting conclusions. There is safety in the familiarity of the rom coms that end in marriage, the action movies that show handsome white men staving off the apocalypse, and the military dramas that glorify the camaraderie and heroism of traumatized American soldiers.
Even in our daily lives, we constantly operate under the influence of mental heuristics that developed as we grew up and exist to save us time and energy: the postman is not a threatening person; the black boy in the hoodie across the street might be dangerous; the woman in the miniskirt looks like a slut; the man in the suit coming out of the Mercedes is someone to respect. To the part of our psyche that relies on these first impressions, their accuracy, fairness, or truthfulness does not matter.