The Queen tried to succeed from the Empire in the 501st journal. Though there was no real reprisal from the Empire like there would be on other worlds. They just installed loyalist politicians to replace the ones who were actively advocating treason against the Empire and business went on as usual until after Endor. Then they were some of the first to join the New Republic after news of Palpatine's death reached them.
The Empire was surprisingly gentle with them considering they were harboring Jedi fugitives. Other worlds like Kashyyyk had it worse for committing the same crime.
Even if you interpreted it as the danger of the Empire resurging if not vigilant it's done sloppily and with no regard for worldbuilding.
The First Order just appears out of nowhere with near infinite resources and having built a superweapon several times larger than the death star. This isn't being negligent, this is being absolutely retarded.
Then the First Order invades and occupies the entire galaxy within a few days.
This is the equivalent of the nazi vampires in Hellsing Ultimate conquering the planet... as in all of it... simultaneously.
Even Legend of Korra of all things does it better, where fascism doesn't just appear out of thin air. Anarchists and bandits tear apart the former good guy kingdom, so a former ally has to restore order, but in the process decides that for order and security to be ensured then the kingdom needs to be restored by force, stronger, and with an iron grip .
When fucking Korra does something better than you, you know you've fucked up.
And speaking of Kuvira's story, it could've gone the same. After the New Republic takes over, they become relaxed and decentralized, as a reversal of Palpatine's extreme centralization during the height of Imperial rule. However, this leads to many of the outlying worlds in the Outer Rim being left to fend for themselves. You can then introduce a few well-meaning Imperial remnants who left the core systems instead of disarming, and they use what's left of their military might to eradicate pirates, extragalactic invaders, and feuding factions, in order to create a lawful and organized society in the Outer Rim.
The people, thankful for the Empire's efforts, openly embrace their new rulers and begin to harbor hatred towards the Republic which abandoned them, leading to a Cold War scenario as both sides start to build up arms due to their mutual distrust of each other. You can even have a lot of Imperial loyalists from the Core Worlds emigrate and join them because they disagree with how the New Republic runs things. They use their economic and technical skills to help the Outer Rim systems develop their economy further, which makes them an economic rival to the Republic-aligned Core Worlds.
A border skirmish between the two factions eventually snowballs another war between the Empire and the New Republic, once diplomatic talks break down and hostilities have mounted to a point where it's beyond salvaging.
Only in-universe explanation that makes sense is everyone prefers the Nazi larpers over the New Republic, especially scientists since they're afraid of Mon Mothma using the mind flayer on them.
Between the Clone Wars and the Empire, you had an entire generation of people who excelled at military engineering, only to be driven out of work once Mon Mothma forced an agenda of extreme demilitarization upon the Republic. So no shit, they'll look elsewhere for employment, and the First Order/Final Order is as good a place as any, considering they were designing top of the line starfighters/warships/planetary weapons. Instead of being shunned by a decentralized Republic because your bread and butter was making weapons of war, you get embraced by the First Order/Final Order, and your skills become a valued asset to their agendas, making you a valued member of their team.
fascism was always better than communism
Fascism is Communism with a Cross and a Flag for ease of digestion, as well as a slight tolerance for private property so long as you don't encroach on the matters of state. It's them realizing that Communism can't work, so they took its totalitarian political atmosphere and tweaked it a bit to make it more palatable to religious people, nationalists, citizens with private property, and economists.