I agree than one has greater positive obligations towards one's community, with the degree of obligation decreasing with the size of the community. However, one also has certain negative obligations against strangers. For instance, there is a strong presumption in favor of a stranger's right to not be killed by you. This is just a presumption which can be over-ridden say in self-defense.

Similarly two strangers have the presumptive right to associate with each other (as employer-employee or tenant-landlord). Do you agree that there is such a presumption? If there is, what if your view is the needed to overcome this presumption?