Part of the problem is democracy. Democracy is messy. If the vision is democracy, then messy is OK because that is the vision. Our country proves that can work--at least thus far. But if the vision is, say, a spiritual community, then the messiness of democracy, the desire for input into the vision can quickly muddy the waters and and blur the vision.
The other problem is that every vision, almost by necessity, has some components that are illogical and irrational. In community this is tough because there are always skeptics and naysayers that keep conflict simmering. But, as a friend recently said, it it's the "F" word (faith) that keeps vision alive. And whether we even acknowledge it or not, all of us have some sort of faith in something. It is identifying and owning our faith that makes it real personally--and in community. Blind faith may have its value, but when we know our faith--accept the mystery of believing in something that perhaps we do not understand, and bask in the awe of what is perhaps the unknowable--then what we can do is love the world in the face of confusion, or fear, or uncertainty.
This is when we finally know that we are all right--exactly because we don't know.