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

In Prometheus, for what reason did Weyland hide on the ship? When he finally revealed that he was in the ship, it turns out nothing happens, there are no particular consequences and the reason for the secrecy is unclear. Why didn't Weyland just inform the crew that he's also aboard in the ship?  Can someone explain to me, what are the reason for this?
Why does Weyland have to hide that he was on the ship?

In the television series "Arrow", how come Oliver Queen doesn't rescue Walter sooner than he did?
Why didn't Oliver Queen rescue Walter sooner than he did?

In Independence Day 2: Resurgence, you're the Super Intelligent Hive-Mind Queen. Over a billion entities can be attached to your brain, but far less seem to be in this sequel than the first, so you should have even more available mental power.  Your Mission: Capture and destroy your arch-nemesis and only real threat: The AI Sphere.  Your Situation:  Your mothership has been cold-nuked from within by a valiant ex-President. All of your support staff is assumed injured or dead. Your Primary Planetary Objective is almost complete (mere minutes to go). This will result in the imminent Destruction of the Planet. Better be outside of Earth's gravity well in the next 30 minutes!! You are continuously being strafed by several fighter craft. You are in an inhospitable climate, running across difficult terrain, and you have just crash-landed at several G forces, so maybe you are not at peak physical health? You know exactly where the AI Sphere is. [With Jeff Goldblum], or so you think.  Why do you expend so much time and energy inefficiently chasing a school bus?

Why did the Queen chase the school bus?