I’d like to add onto that- the Death Star is not the focus of ANH. They don’t describe how it works. The moths don’t argue on the morality of their actions. The primary focus of the movie is Luke’s adventure.
In Lord of the Rings we have the Uruk-Hai, a new invention that makes orcs stronger. That’s not the sci-fi, it just raises the stakes. Likewise a station with the ability to destioy a planet through magical crystals is likely impossible.