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

At the end of the movie Artificial Intelligence: A.I, the young protagonist David is found by the Mecha after 2000 years encased in ice.  According to their representation of the blue fairie, there was no detail too small that David didn't store for them, yet they do everything in their power to fulfill his wishes - but why?
Why was David's happiness so important to the Mecha descendants?

During an after trial meeting, the bosses decide to eliminate anyone involved or with knowledge of the skim in order to keep them from testifying.   The car bombing wasn't authorized and Nikky was the one responsible for that, so why was Sam spared by the bosses?
Why was Sam "Ace" Rothstein spared by the bosses?

Die Hard includes a moment when police officer Al Powell says he is on "desk duty" because he accidentally shot a child who had a toy gun. But earlier, Al is shown in uniform, driving a "black-and-white" (a police car) around a neighborhood.  If Al was on desk duty, why was he in uniform, driving a car around the city, wearing the sidearm that he eventually uses to shoot Karl?

If Al Powell was on desk duty, why was he driving black-and-white?