who should be to blam,robber or passsserby ?

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"You see this woman has been robbed by me, but you did not give her a hand, you are such a coward and you are not a man."
- A robber sneering at a passerby after he robbed a woman in Siping of Jilin. He robbed and beat the woman December 25, but when he saw that a passerby witnessed the robbery, he stopped beating the victim and began to insult the witness. This passerby did not say a word until the robber left.
     while   reading   this news ,I  feel so sorry .I feel confused  who  should be to  blam .All I CAN DO is to keep silent  ashamed  like  the passerby  in this story !