"No greater cause"

From the Endangered Catholics website:

PLEASE JOIN US FOR A WEEKLY PRAYER SERVICE AT ST. CASIMIR'S CATHOLIC CHURCH, UNJUSTLY CLOSED BY BISHOP LENNON.

The “Prayer Service will take place EVERY SUNDAY in front of St. Casimir's Church at 11:30 am on E. 82nd Street between Sowinski and Pulaski Streets.

Come with your cars packed full of supporters for this most noble cause.

There is no greater cause than to save a church built by our parents, grandparents and great-grandparents!

Really? No greater cause?

Whenever Pro-lifers talk this way, viz, "There is no greater cause than to save the life of an unborn baby," we hear all kinds of people taking issue with the statement. Catholics on the left start bringing up feeding the poor, social injustices, victims of global capitalism, the seamless garment stuff, innocent people killed in a war somewhere, etc. So I wonder why someone thinks they can make a statement like this and suddenly have it be taken seriously.