Could it just be luck? Some author writes a hit story. That story influences followers. If the original story was a downer then suddenly there are more downer f

Could it just be luck? Some author writes a hit story. That story influences followers. If the original story was a downer then suddenly there are more downer followers. It becomes a kind of culture or bubble that most people are unaware they're viewing everything through that lens. Further, modern media takes that even further. Plenty of producers, marketing people, people with the purse strings just want more of whatever was popular last year. Which creates a trend to produce more of the same. Yes, real life events are also an influence but similarly, one extremely popular title can influence followers for years/decades. To put it another way, if there was no Walt Disney would there be 150+ famous family oriented feel good animated movies that have influenced so much of our culture OR, would we have some entirely different culture because one artist (or team of artists) works didn't have that particular level of influence.