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

Jon Snow from Game of Thrones is a man of honor. When he killed the dragon queen in S08E06, he didn't even escape but told the truth. But then why did he kill her with a back stab? Not literally, but he kissed her and she didn't know that he has a weapon.  I understand that maybe he couldn't kill her another way, but that's not a very honorable anyway.
Why did Jon Snow do this immoral act if he is so honorable?

In the Transformers films the Autobots and Decepticons always change between their humanoid form and (with the exception of Bumblebee's upgrade) the same cars.  Assuming that they choose vehicles because they want to blend in on earth, they must be able to transform into a myriad of other mechanical objects (most likely with some size restrictions).  Why don't they transform from plane to car to ship and back again as required?
Why do the Transformers always transform into the same cars?

In Precious (2009), Weiss goes to get a cold drink for Precious.  At that time Precious steals some file from Weiss's files & puts it in her handbang.    Why did she steal that file? What is in it?

Why Precious stole the file from Weiss's files?