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

In Wall-E, when EVE returns a little plant back to the spaceship, a plan is shown telling humans to go back to Earth.  How can they know Earth is safe based on one little plant? Can one plant represent that an environment is healthy and safe?
How can the Axiom computer know Earth is safe based on the one little plant EVE found?

When Cooper and Tars figure what Dr Mann is up to in Interstellar, he tries to escape with a shuttle and manually docks the Endurance but he doesn't manage to get a secure lock.  As a highly-trained astronaut he should know this is no good yet he chooses to open the airlock and destroy the ship and, arguably more importantly, to have his innards sucked out.  Why does Dr Mann act so foolishly?
Why does Dr Mann act so stupidly?

The CIA Director enters an elevator with someone and asks about Jessica Chastain's character.   The assistant claims she is really smart, to which the Director responds with, "We're all smart".   What is the significance of this sequence?

What is the meaning of the elevator scene in Zero Dark Thirty?

