Why is the Fabelmans a 15?

Excuse me, but could you elaborate on why the movie "The Fabelmans" has been rated 15 by the relevant authorities? I'm curious to know what specific content or themes within the film have led to this classification. Is it due to language, violence, or perhaps mature themes that might not be suitable for younger audiences? Understanding the reasoning behind the rating can help viewers make informed decisions about whether the film is appropriate for them.