A good leader is a protective leader. The cave concept probably derived from a secret place called the village "egg-nest" where women, children, and elders would be hidden during a raid. May be applied to other situations: a good plan in battle; an indispensable custom.
Rain falling during an ocean squall often seems to wipe away the winds and still the ocean. A good leader should be able to dispel the problems facing his people. He can calm down disputes and settle problems easily.