Because people want plot. People want conflict. People aren't interested in ordinary people doing ordinary things. That doesn't make for a good story. A good story consists of interesting characters in plots that pique interest. Would you want to read about a man who goes to work in an office forty hours a week, goes home to his beloved family, then repeats the next week? Conflict is what makes a story.
I would also argue that the greatest stories aren't necessarily those about heroes, but possibly ordinary people placed in extraordinary circumstances.
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