People don't do what's always in their best long-term interest. They don't always even act in their best interest in any form. Re predictability: You could say

People don't do what's always in their best long-term interest. They don't always even act in their best interest in any form. Re predictability: You could say that about agriculture too. Think about the great potato famine in Ireland. Agriculture's not immune to famines from droughts or pests.