Well the purpose of the Catholic Church is supernatural.  Concern and "heading" of souls, all souls.

Church-State relations are best understand using some teaching developed by the Catholic Church, which hinges on two principles: "distinction of ends" and "harmonization of ends".

The Church's focus is, as I said, supernatural.
The State's focus is on the common good of all.

It's the lay's job, mainly, to do the "harmonization," as we live out the Gospel in our ordinary work.  

So our concern should be toward ways that can help people reach their end: heaven.  And most of the concerns of native american's isn't eco related, but truly spiritually related.  

Addictions on reservations are a huge problem.  

But "occupiers" love a protest..and invade reservations..or anywhere, where they think cameras will be clicking.