Many people enjoy discussing and judging the morals of characters in films, but that’s not the main point. Very few characters are entirely good or entirely evil, which tends to result in dull and poorly made movies. Regardless of whether viewers resonate with the story, they should show compassion for the characters. It’s important to interpret their motives and circumstances to understand what led them to make certain decisions and to reflect on ourselves.
No, they are two parts that interact with each other and both are necessary for the whole thing to work well.
In Alien when the guy is brought back to the ship, the captain cares about the individual and wants him taken to sick bay. Ripley is thinking about the whole crew, not the individual, and refuses to skip quarantine proceedures. This is made clear in dialogue. The plot is the alien being brought onboard the ship. They interact with each other, but without the conflicting motivations and moral nuance of how each character sees the balance of one person vs the whole crew the scene would have zero tension.
No sorry that’s not how that should work