A second reason for choosing community over isolation centers on psychological health. We do not become whole by ourselves. We cannot get ourselves together before or apart from others. Personal mental health is achieved in and through contact with all of the others who struggle with the same demons as ourselves. Helping one another, we help ourselves.
Community is required as well for the health of a society.
In America our political decisions too often come down to selfish motives. These political judgments will rot our country from within, since they are based not on a proper sense of the common good, but on what's good for me and mine. Good communities ask different questions of the larger body. Every indication we can find in the gospels points to the Lord doing and preaching selflessness, kinship, and togetherness. He called individuals and immediately formed them into a school of apostles.