It is precisely because neither individuals nor small groups can be fully self-sufficient that cooperation is necessary to human survival and flourishing.
The reason the government sells the census as your ticket to getting goodies - rather than as your civic duty - is that distributing goodies is now all the government does.
Libertarians argue that no normal adult has the right to impose choices on other normal adults, except in abnormal circumstances, such as when one person finds another unconscious and administers medical assistance or calls an ambulance.
Equality of rights means that some people cannot simply impose obligations on others, for the moral agency and rights of those others would then be violated.
The first census in 1790 asked just six questions: the name of the head of the household, the number of free white males older than 16, the number of free white males younger than 16, the number of free white females, the number of other free persons, and the number of slaves.
Libertarians recognize the inevitable pluralism of the modern world and for that reason assert that individual liberty is at least part of the common good.
Abstraction is a mental process we use when trying to discern what is essential or relevant to a problem; it does not require a belief in abstract entities.
Libertarians typically argue that particular obligations, at least under normal circumstances, must be created by consent; they cannot be unilaterally imposed by others.
But there is no obvious reason for holding that some normal adults are entitled to make choices for other normal adults, as paternalists of both left and right believe.
Libertarians recognize the difference between adults and children, as well as differences between normal adults and adults who are insane or mentally hindered or retarded.
To repeat, communitarians maintain that we are constituted as persons by our particular obligations, and therefore those obligations cannot be a matter of choice.