In general, most situations accurately follow the idiom that social justice foundations stem from how ordinary people react to extraordinary situations. For an event to trigger a social justice response it is likely something that does not commonly occur. If some action is part of the social norm and people see it happening all around them, then people become desensitized to it and that action will generally fail to trigger a social justice response.
An interesting example of this ideology is currently unfolding in regards to marijuana regulation. For a very long time, marijuana has been an exception to the previously stated social justice idiom. Although almost half of all Americans, including a majority of recent presidents, politicians, and celebrities, have used marijuana, marijuana has been both illegal and socially frowned upon for a long time. As it becomes more and more apparent that marijuana use is not an extraordinary situation, and rather is a completely normal situation, political action is starting to follow. Even on the highly controversial use of marijuana, the federal government has now decided to quit enforcing anti-marijuana laws.