The film cannot give a complete picture of a person with all the versatility of his character. Instead, several features are taken from the character, which are illustrated most vividly and expressively. From this, many qualities, whether positive or negative, are exaggerated. That is why we want to adopt them, since we see the apotheosis of their manifestations on the screen. But we all understand that even the bravest hero does not always manage to act bravely, and the honest one does not always succeed. Cinema is an action game, life, unfortunately, is much more complicated, and actions cannot be permanent, since there is no pattern in them. Often in the cinema we are given one-dimensional images: if the hero, then the hero in everything, if the villain, then to the tip of the bone. Yes, of course, sometimes they try to balance these images with atypical qualities for them, but all the same, this is significantly different from the actions of people and their characters in real life.
Films are usually made for a specific age audience. All trailers and advertisements are designed to attract the right age group. And these films reveal the problems, tasks that most people in this group have. Therefore, a person can identify with the character, and so on. more and more often ends well in movies, the person wants to be like.
Because the heroes of films are often strong personalities, so decisive, with a core, regardless of the quality of their actions, and young, and not only people, sometimes want to be like a strong-willed person with an interesting destiny.
Plus, the hero often experiences the emotions that the viewer experiences at this moment and the viewer, willy-nilly, gets closer to him. Or is experiencing what the person watching the film would like to experience - this is also a factor of emotional rapprochement.
Then this rapprochement is transferred to behavior, imitation of the actor.