Megan McArdle is still on a roll:
Americans, as a group, embrace the ideal that there is one contiguous set of morals for everyone. It’s not okay to steal from your employer, not even to give it to your cousin who really needs it. It’s not okay to attack, rape or kill people even if they’re not related to you. These things do happen, but they’re not widely accepted as the norm. That’s huge. That’s what makes America work.
Read the whole thing.