[Sherman Logan]

Subsidiarity is an organizing principle that matters ought to be handled by the smallest, lowest or least centralized competent authority.

Problem here is I strongly suspect the Pope was talking not about redistribution of wealth within a city or nation. He was talking about worldwide redistribution.

The least centralized authority competent to handle such redistribution would more or less by definition be a world government. One empowered to force national governments to cough up.

[Salvation]

But it has to start small.

Give a bottle of water to the homeless person on the street.
Just one example.