They're nearly there, but not quite yet. Else they wouldn't need a military at all if they had moved past killing one another.
I disagree...
Just because they stopped fighting among each other doesn't mean they are perfectly safe. Who knows how many other species are out there (not even considering the constant threat of the Shivans). And if the Humans have no military at all, any of those "spiritually less advanced" races could just conquer or annilihate the Humans at their leisure if they don't resist.
And since the Humans, to my knowledge, don't know how jump point come into being, they can't just assume they are perfectly safe, since anytime a new jump point can form that connects them to another races terretory, or worse Shivan terretory.
After all the Humans in Sol know nothing of the reasons for the Shivans hostility or the Shivan-Vishnan relations. They just know the Shivans want to annihilate them.