Ideal citizens of a "compassionate" socialist state. Do nothing, see nothing, and wait for the police to (eventually) take care of the problem. Actually, I bet some thought of helping but were afraid of being tried for a hate crime -- "These innocent youngsters were just having harmless fun and you committed violence by punching them." Far from creating a sense of community, socialism fosters an every man for himself attitude, as you noted, where people are conditioned to be like sheep.
More informative story:
http://www.jpost.com/servlet/Satellite?pagename=JPost/JPArticle/ShowFull&cid=1089516099595