It's sometimes hard to comprehend whether child actors in R-rated films can be shielded from the adult themes in the films that surround them. At 12 years old, Chloƫ Grace Moretz was instructed in "Kick-Ass" to repeat nearly every curse word that exists, and a few years later, Jacob Tremblay appeared in one of horror's most disturbing death scenes in Mike Flanagan's "Doctor Sleep." This was a few years after Tremblay had already given a harrowing performance at age seven alongside Brie...