Jim looked at Kirk now, watching him. "The incentive to become someone we don't feel tempted to eliminate," he said. "Right now, he is a prisoner. Anything he can do is better than where he is. He knows that. He also knows that it is likely he'll be executed--he'd long ago have done so to any of us, in his position. He knows there is no chance of him living freely among us. But what would he do, given some alternative?"