Because they are people like you and me. Which means they fuck up too. Its important to follow only select qualities of people and not people as a whole. Because some people are assholes. For example, lets say you like an artist. You follow the artist on all social media. You literally wish to “be” them. All of a sudden, you hear that the artist paints beautiful pictures for a living and fucks kids during down time. What do you do then? Every picture the artist ever painted makes you nauseous now. But what if you disregard the person and focus just on the work?
How about fictional characters for role models? I don’t see anything wrong in that. Except they are not real.