There are plenty of real life historical examples of victors shooting themselves in the foot in roughly these sorts of ways.
Are there? I'm raking my brain, but I can't find a similar instance, where after a massive, genocidal war, the winning side (that also ended up on the receiving end of the genocide) would then just go "We don't need an army from here on out and we will in fact have no system in place to deal with a resurgence of our mortal enemies."
There's a long tradition to military blunders and political failures, sure, but on this scale, I can't think of one.
The closest thing to an explanation is that there's a lot of resources in the Unknown Regions which is as lazy a handwave as they come.
It also doesn't make any sense, since if the Unknown Regions had such an abundance of resources, they'd be strip mined and no longer be "Unknown".
Total sidebar, but as a kid, before the prequels, I always assumed that "Ben" was Kenobi's "Real" name and "Obi-Wan" was his "Jedi name". There is literally nothing to indicate this, but it was my own personal head-canon for reasoning why he would use "Ben Kenobi" as an alias for "Obi-Wan Kenobi". It isn't an alias! Its just his real name that he re-adopted after the Jedi fell.
But then the prequels happened and pretty much killed all of that, lol.
I sort of assumed it would be akin to a title or rank, like "Sensei".
In other news
Hux not-Tarkin has no fans.
Poor guy, he's doing the best he can with his character, but he's way too goofy and way too campy. He'd fit right in with characters like Igthorn or Skeletor, but part of me thinks he'd be too campy even for that.
It's one of the things that I said when I first joined this thread:
When you model a pseudo-nazi villain after a nazi character, who would be more intimidating?
If you modelled him after Colonel Klink:
Or if you modelled him after Vidal from Pan's Labyrinth:
Hux used to be a serious character, but Ruin took him and turned him into a comic relief - while also deciding to wipe out Snoke. I really do not understand this at all.
Ruin took away all characters that felt like a threat, who did he think would take over as main villain? Kylo? It's just so utterly mind blowingly idiotic.