I\'m taking a Social Psychology course and we are currently discussing the psychology of spectators of murders, assaults, etc. The most amazing example is how ~40 people in an apartment complex just watched a woman get brutally stabbed for OVER 30 MINUTES! Not a single person called the police, yelled, came to help her, or anything.
Its amazing how many factors are involved... Such as not feeling its your place, someone else will do it, etc.