Netflix's splashy take on Lord of the Flies has renewed interest in the tale, which follows a group of British boys descending into savagery after getting stranded on a remote island. So let me repeat what the great psychologist Peter Gray always reminds us about that story: It is fiction. We can't use it as a reason to give kids less freedom because "this is what happens." No, it isn't. In fact, as Gray points out, there's a different story of …