Full Idea
When players will never meet again, the strategy of defection is the only stable strategy.
Clarification
'Defectors' are non-cooperators
Gist of Idea
When players don't meet again, defection is the best strategy
Source
Robert Axelrod (The Evolution of Co-Operation [1984], 5)
Book Reference
Axelrod,Robert: 'The Evolution of Co-Operation' [Penguin 1990], p.92
A Reaction
This gives good grounds for any community's mistrust of transient strangers, such as tourists. And yet any sensible tourist will want communities to trust tourists, and will therefore behave in a reliable way.