Groups have bogged in their own complexity, submerging under details of process and structure and seeming never to break surface. Sometimes arguments go on for so long people forget what started them in the first place. The big picture shatters into a fragmented mosaic, is splattered with distractions, or both. Being both realistic and fair, chalk it up to human limitations. Keeping a focus is one of the most difficult challenges humans face, particularly a collective focus.
Greens have their own focalizing iconography in the key values.
So when Greens seek unity, the key values are an obvious starting point. A political party particularly needs a clear and fairly simple message. Greens want to communicate with a mass public that, especially in the anti-political context of American culture, has a limited attention span for politics. Pulled to and fro by family, work, etc. Witness the fact that most successful political campaigns in the U.S. continually hammer on three or four main themes.