Tangible God
Lets all love Lain
It's like with Palpatine. If Vader had survived and killed or turned Luke, and Vader himself didn't come back to the light, he would take control of the Empire, it would stand. Vader is galactically famous and I don't need to say why.
But he didn't. And after over two decades of being ruled by the two remaining Force-users, Sith at that, noone would look upon anyone who isn't a powerful Force as their leader.
That's why they splintered, noone to lead them, so it's time look out for #1.
Same goes with any Empire or country. If you're leaders die with noone to replace them, it's in our being to form our own tribes and gov'ts.
And it doesn't matter if we're from Earth or the technologically advanced galaxy of SW, we're all just human, it's our way. That's why, since the Empire was mostly human, they factioned.