In "Food for the Common Cold," what reason does Frick give for wanting to tear the headstone down, and what commentary does David offer about this?

Frick says that they need to return to the old ways, but he cannot explain what this means. David comments that Frick, although a medicine man, has been drinking too much and neglecting the prayers and ceremonies that are a part of this position. He is implying that this dereliction is related to Frick's inability to explain his reasoning for wanting to tear the headstone down.