I think the fact society hasn't "fallen apart very quickly" has more to do with us building economical and organizational systems to prevent morally dubious people from doing whatever they want, not the fact that most people wouldn't.
How much of our moral inclination to not rob or steal would still be there if we didn't grow up quickly learning that it's illegal? Especially if we're not even stealing from a fellow human, but some anonymous corporation.
Furthermore, you only need a few people to break the rules to do damage and potentially erode trust in the system, and if that trust is gone, the social contract to behave well to each other is even more at risk.
How much of our moral inclination to not rob or steal would still be there if we didn't grow up quickly learning that it's illegal? Especially if we're not even stealing from a fellow human, but some anonymous corporation.
Furthermore, you only need a few people to break the rules to do damage and potentially erode trust in the system, and if that trust is gone, the social contract to behave well to each other is even more at risk.