Water had the capability to hold up the thin overhang of the underground.
When water is depleted, there is nothing to support this overhang, which eventually led to the formation of sinkholes.
As for the collective behavior, it's all because of the scarcity. Water is one of human's basic needs to survive. When water is scarce, this will force the people to compete with one another to obtain it, which will cause the behavior
If the patient makes any statement that includes the wrong measures or actions that should be taken to prevent side effects then it is clear that they need further teaching. On the basis of treatment for psychosis with perphenazine then such wrong statement may be something like the following: "If I have a dry mouth then I need to take lozenges or eat hard candy for a period of 2 weeks"
