The hole is pretty bad. It's like a giant void in the middle of the backstory that came about because before the backstory was finalized, they stuck all the different pirate entities where their fittings would be most useful. i.e. Sansha between Amarr/Caldari, Guristas on Caldari, Angels between Matari/Gallente, etc.
Then created the stories for them
later.
Sansha's Nation's story is
still barely expanded upon, and when it was released it was a giant "DOUBLE-EWE TEE EFF" in comparison to where it goes.
They encroach on the Amarr Empire because that's where CCP happened to put them. The Caldari have the hatred for the same reason.
After CCP put them there they gave them a really cool story that
didn't coincide with their activities.
And no one ever really seemed to care or attempt to justify it.
And as to this:
The Caldari because publicly they certainly have to appear extremely anti-Nation or be accused of collusion, perhaps?
No. I asked. This is almost entirely perpetuated by myself, Dust Angel, Izzy, and Ghost, and stemmed from Dust and I coming up with an excuse.
Sansha's Nation not allowed feelings of vengeance?
My point being, it's not a one-way street is it?
Look at it from the point of view of the Nation considering the Caldari and Amarr their deadly foes precisely because, as they may see it, the Amarr and Caldari stabbed them in the back when the core empires joined as one to stamp the Nation out.
Possible, yes, however were this the case you'd think I'd have gotten an answer about it the numerous times I've asked. Therein lies the problem. When
CCP doesn't know why something doesn't mesh with the backstory by appearances, there's a bit of a problem.
That I suppose is my primary issue.
Besides, were that the case they would have it worse for the Caldari than the Amarr; and they spend more time invading Amarr space than Caldari space, because the Caldari jumped ship way early, and the Amarr were very reluctant to turn away.