Agreed. Unanimous decisionmaking is totally unworkable, for a variety of reasons. The key to unity is not universal participation in decisions. Unity comes from shared values and a shared world view.

A group that has shared values and a common world view can easily elect, by simple majority, decisionmakers that everyone is comfortable with and confident in. The difficulties come into this process only because not all voters have the same values or the same world view. In the latter situation, it really isn't a community at all. It is a frontier, with multiple "colonist" groups vying for power over everyone.