This claim strikes me as a fairly disingenuous interpretation of “Catholic Social Thought”:
>The difference between these visions is considerable. Various forms of libertarianism and anti-government conservatism share a belief that justice is defined by the imposition of impartial rules — free markets and the rule of law. If everyone is treated fairly and equally, the state has done its job. But Catholic social thought takes a large step beyond that view. While it affirms the principle of limited government — asserting the existence of a world of families, congregations and community institutions where government should rarely tread — it also asserts that the justice of society is measured by its treatment of the helpless and poor. And this creates a positive obligation to order society in a way that protects and benefits the powerless and suffering.
It will all depend, of course, on what one means by “limited” or even perhaps, “principle.” Both liberals and conservatives want “limited” government “in principle”. Pointing out that principle in defense of this or that merely demonstrates the degree to which one fails to understand that reference to ambiguous principles resolves nothing.