Reconciling the social contract with ethics more oriented toward duty

How do you reconcile the social contract with ethics more oriented toward duty? Are the two mutually
exclusive, or are there overlaps? To contextualize this discussion, read the Los Angeles Times article and view
the video of police using pepper spray against apparently peaceful demonstrators at the University of California
Davis.
Were the police doing their duty? Was the social contract violated? Is there a way that these two ideas can coexist?

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