In 1977sStar Wars, the Empire has finished building their ultimate weapon, the Death Star.
Whereas the Death Stars could wipe out whole planets, this Starkiller Base could destroy whole systems.
It was destroyed at the end of the film due to the Resistance capitalizing on a structural weakness.
There are two explanations, one based in the real world and one in theStar Warsuniverse.
The In Real Life explanation
The Death Star is awesome.
Plausibly moonish, some might say.
Plus it has nooks and crannies.
Plus it has a canteen.
Plus its inStar Wars, which isreally good.
Thats why it keeps coming back, because its cool and scary.
See also: Why dont we have another Hunger Games?
Its worth noting that Grand Moff Tarkin really wanted the Death Star to succeed.
And so it was that Tarkin believed to the last that the Death Star would triumph.
When it failed, the Emperor was miffed.
Hence, a second Death Star.
When the Emperor arrived on the Death Star II, it was still unfinished.
Nonetheless, he felt secure due to the security measures in place guarding the shield generators on Endor.
Theres almost certainly an excellent reason why the shield generators could not be keptbehindthe shield.
There are many historical parallels with the Empires behavior.
And yet its destruction may have been averted if the First Order had watchedJurassic World.
It needed to be regulated, thus providing a weakness for the base.
In the end these plans failed due to their being overambitious.
Building a moon-sized gun is also somewhat overambitious.
Trying to use said gun once the blueprints for it have been stolen is optimistic at best.
As a wise man once said, Dont get cocky.