Building one space station for everyone was and is insane: we should have built a dozen.
A civilization has the ethics it can afford
The reader has certain rights. He bought your story. Think of this as an implicit contract. He's entitled to be entertained, instructed, amused; maybe all three. If he quits in the middle, or puts the book down feeling his time has been wasted, you're in violation.
Never fire a laser at a mirror.
The value of a thing is what that thing will bring. -Legal Maxim
One mark of a good officer, he remembered, was the ability to make quick decisions. If they happen to be right, so much the better.