Jared Diamond suggests that the US state of Montana is a modern paradigm for his theory of 'ecocide', where a society's failure to recognise environmental degradation ultimately leads to its demise. However, Diamond's analysis of Montana is factually flawed and lacks a historical understanding of institutions and incentives which have both caused problems and resolved conflicting ideas about how natural resources such as water, forests and minerals, should be managed. Montana is actually a modern paradigm for why the changing preferences and values of any society are best accommodated by institutions that enable values to be expressed through voluntary decision-making rather than through the political process.