Q: Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title
In the Maze Runner, WCKD wants the kids to escape the maze, but they have made it almost impossible to do so because they have Bio-Tech creatures called Grievers created by WCKD patrolling the maze at night, but when kids go into the maze but they don't come back alive if the doors closed, that's saying something, but wouldn't they send something else instead of Grievers in? I understand they want to map the the patterns of the killzone in the kids brains and their immunity to the flare, but to kill them while in the maze? surely WCKD would want them to live and save humanity rather than be murdered by a gigantic maze. What I'm trying to say is: They could have picked a creature that wounds the kids but not kills them so why didn't the organisation do this instead?
A:
Why would WCKD use Grievers?