3. Bystander effect: global risks have less perceived national security importance
The focus of each country is on risks to that specific country. Global risks are only considered if they are well understood, like nuclear war or global warming. As a result, there is a bystander effect1 or "Tragedy of the Commons" whereby risks that threaten us all but no particular nation individually are poorly analyzed and prepared for. This is analogous to how a collapsed person in a busy area is less likely to be helped than if they are in a less populated area.