Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

Q: In Interstellar, when Murph visits her brother and his wife, she notices that their son is coughing hard, and she offers to arrange a visit from a doctor for him. The brother and his wife refuse, however, even though she warns them their son will die otherwise.  Did it signify anything? I thought that maybe it signified that there is an anti-science movement because of the blight. The brother certainly seemed to dislike his father and sister's scientific pursuits.

A: Why did Murph's brother and his wife refuse a doctor for their son in Interstellar?
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Q: In the movie Predator  (1987), near the climax, when the Predator finds Arnold, it did not try to kill him immediately. Instead, it goes near him and checks his head and removes its helmet (I am assuming that it would be its helmet).   Why did it not kill Arnold immediately as it killed everybody else? Did checking Arnold's head mean something?

A: Why did the Predator not kill Arnold immediately as it killed everybody else?
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Q: Criminal Minds S9 Ep2 - "The Inspired (Part II)"  When they make arrests at the end:    There seems to be some difficulty over whether they have Jesse or Wallace. They use his learned nervous tick as a differentiator and arrest him accordingly.   Why would they need to do this?     Surely they could just ask him questions that Jesse would know the answer to (e.g. who are these pictures of? What happens in a normal day at work?) and demonstrate it was Wallace by his lack of knowledge of Jesse's life? Also, the BAU would knew he suffered from hallucinations, if they kept him talking long enough he would eventually give himself away.   Perhaps there is there some aspect of the American legal system that I am not familiar with? Or did miss something in the episode?

A:
Why the confusion over who was arrested in Criminal Minds?
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