I think we should see the Ubuntu-GTVA ideological conflict from a different point of vue. Let's remember Capella : the Shivans can't be defeated with military actions. It's a fact. Yes, we can slow them down, yes, we can isolate ourselves blowing nodes up, but eventually, we can't win a war against the Shivans.
Starting from this fact, GTVA's point of vue is wrong. Even if they win the war against the UEF with minimal losses, get the hand on Sol industrial power and build a huge fleet of Raynors and Titans, they can't hope to win a war against the Shivans. The only thing they can hope is either to stop them temporarily
via node collapsing, or make a last stand before going into hiding
à la Sanctuary. Humanity can't spend its history fighting an invincible enemy, dreading about their next incursion, or go in hiding forever in a sleeper ship.
So, that being said, what remaining choice do we have ? The Ubuntu is not ready for a military conflict against a xenocidal race, it's also a fact. But as I just said above, the military solution isn't the good solution anyway.
Now let's remember Age of Aquarius. How did the 14th Battlegroup and the Sanctuary made it back to our universe, while the whole Shivan armada wanted them dead ? Not really thanks to their military might. They survived because of the
Vishnans. More precisely, because the Vishnans
chose to save them.
Now why did they chose to ?
They have created. They have created communities where former enemies can live in peace. They have created peace from war, where former enemies are now friends.
Both races exhibited potential.
And what is humanity doing in War in Heaven ? Where are the communities, where is the peace, what do we
create, where is the potential the Vishnans decided worth saving ? And add to that the fact that even the relations between the Terran and Vasudan in GTVA are damaged, and you will be starting to understand my point.
Only the Vishnans have the power to stop the Shivans. But if we ever manage to contact the Vishnans in our universe, they probably won't be so much willing to save our races if we continue to fight each other.
Conclusion : War isn't the solution. But basing all our hopes on the Vishnans when we don't even know how to contact them, and not even being assured that they will help us, isn't very clever either. Maybe it's too late, maybe we have already wasted our potential as a race, and then we can only count on GTVA's military solution. But maybe not. We know some Ubuntu leaders "claim that they are in contact with a sophisticated alien race", and same goes for some Vasudan "prophets". Maybe it's the Vishnans. Maybe it's just fantasizing. Maybe it is something totally different. But it also may be the last hope to "bring the rest of our race to enlightenment".