Depraved

Ready for a real downer? A homeless man puts his life on the line to help a woman being assaulted. He is stabbed and collapses in his pursuit of the attacker. Dozens of passersby do just that - pass by - without even calling 911. The man was not reached in time and died for his efforts.

A bit more uplifting is the interview bit afterward. The psychologist tries to make sense of the situation, but naturally misses the most logical explanation. He mentions a couple of possibilities:

1. Passerby Effect
2. Deferral of Responsibility
3. Desensitization to Violence

But misses that the heart is desperately wicked. Who can know it?