Which is the enlightnment idea that explained that government and its people form a contract and that a government that breaks its contract should be replaced?

Hee the american public did not truly take in the horror of adolf hitler's regime until years after the existence of concentration camps was first reported in american newspapers. partly this was the fault of the media, which did not give prominent placement to news of the holocaust. what other factors do you think contributed to the long delay in understanding the holocaust?