There’s this great misconception that the Slitheen are for kids and episodes like “Human Nature” and “The Family of Blood” are for adults. In fact, adults can enjoy daft green monsters, and kids can appreciate the emotional, grown-up drama. Pixar understands that perfectly. J.K. Rowling does. If kids are upset, then they’re feeling something, and kids feel things vividly. The death of a goldfish is like the end of the world. It’s keen, real and powerful for them. But that doesn’t make it something to be avoided. If they can reach that state through fiction, well, they’re actually experiencing something wonderful. And important.
Russell T. Davies, head writer, Doctor Who (2005-2010) on one of my favorite subjects—the absurdity of demarcating material along lines of age and genre, and trusting audiences to get it.