It appears that it is teaching us that involvement with the community is itself the will of G-d. All matters relating to the needs of the tzibbur are in fact what G-d wants. When the tzibbur is praying. We see that G-d has a desire for the tzibbur, and what He wants is to fulfill the needs of the tzibbur for which they are praying. This concept of tzibbur is very deep.
Sin exists only in individuals.
The only prosecution comes through the individuals who have sinned. The underlying principle here is that the tzibbur is attached to the will of G-d. Man has the ability to create a situation where all that he wants is realized. In this state, he would not be missing anything that he wants. This can simplified into two general provisions that include all that man truly needs.