The groundwork for their affinity for each other has been well-established long before they actually meet.Meanwhile, Clara was in pursuit after them on horseback."Doc" fed the locomotive chemically-treated Presto logs to burn hotter and longer in the furnace to increase its speed, while Marty sat in the DeLorean.The Western genre was employed to tell an uncharacteristic social problem tale about civic responsibility, without much of the typical frontier violence, panoramic landscapes, or tribes of marauding Indians.Both were worried about the future of democracy: "I worry about how democracy survives when one man can move cities with his mind.The film""s complex, deeply-nuanced hemes included racism, individuality, the American character, and the opposition between civilization (exemplified by homes, caves, and other domestic interiors) and the untamed frontier wilderness.