The state has a positive moral function. It is an instrument to promote human dignity, protect human rights, and build the common good. All people have a right and a responsibility to participate in political institutions so that government can achieve its proper goals.
The principle of subsidiarity holds that the functions of government should be performed at the lowest level possible, as long as they can be performed adequately. When the needs in question cannot adequately be met at the lower level, then it is not only necessary, but imperative that higher levels of government intervene.
Symposium on Entitlements, 11 Notre Dame Journal of Law, Ethics & Public Policy (Summer 1997)