Making sure those defectors don't destroy the very cooperative systems they're abusing is an age-old problem, and we've developed a variety of societal pressures to induce cooperation: moral systems, reputational systems, institutional systems, and security systems.
Understanding how these different societal pressures work and fail is essential to understanding the problems we face in today's increasingly technological and interconnected world.
Here's Bruce Schneier's keynote from Hack in The Box Amsterdam 2012:
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