From a Christine Rosen piece in the Wall Street Journal:
... Another recent attack, on a blind man walking down the street in broad daylight in Philadelphia, garnered attention because security footage later revealed that many passersby ignored the assault and never called 911. Commenting to a local radio station, Philadelphia's chief of police Charles Ramsay said that this lack of response was becoming "more and more common" and noted that people are more likely to use their cellphones to record assaults than to call the police.(via Prufrock)
Our use of technology has fundamentally changed not just our awareness in public spaces but our sense of duty to others. Engaged with the glowing screens in front of us rather than with the people around us, we often honestly don't notice what is going on. Adding to the problem is the ease with which we can record and send images, which encourages those of us who are paying attention to document emergencies rather than deal with them ...
The problem with many of our new gadgets, as the San Francisco shooting suggests, is that they often keep us from experiencing these face-to-face situations and the unspoken obligations that go with them. Most of these duties—to be aware of others, to practice basic civility—are not onerous. But on rare occasions, we are called upon to help others who are threatened or whose lives are in danger. At those moments, we should not be anticipating how many views we will get on YouTube if we film their distress; we should act. To do otherwise is to risk becoming a society not just of apathetic bystanders but of cruel voyeurs.