"But, how can you be sure that her blade will not be pointed at us eventually?" Mr. Winter suddenly asked, he was well aware of the darkness of the human heart, especially now that they knew that there was no more justice to hold them accountable, morals would surely drop to nothingness now that nothing was holding them grounded. He can't afford to let his only son be misled by someone or be taken advantage of by blackhearted people, especially through seduction.
Now that everything has become so dangerous, they tend to think of the worst-case scenario before anything else, they have no leisure to think otherwise because that might lead to their own downfall.
They couldn't shake their doubts, especially given Vulture's evident reverence for Kisha, a reverence previously reserved for Duke alone. It seemed as though Vulture regarded her with a godlike reverence, treating her words as if they were sacred creed.