Love this saying: We know the one thing we can expect with any certainty is impermanence .

And also there, there is some rule/order/consistency holding the chaos together.

About the randomness of human acts that disturb natures order: I feel human being are actually meant to bee earthkeepers. The keepers of the earth and everything on it. Using their intelligence to overcome natural imbalances, working together with evolution and compensating for what they take.