Why is anyone surprised that angry young men act out violently in a long standing some what ethnic conflict? Its pretty much what angry young men around the world have always done. The big difference is that despite years of Arab street violence, crime, theft, and public, loutish, disrespect of Jewish women on the street, that it is angry young JEWISH men acting out. "If you cut me, do I not bleed? The real story should be about the restraint displayed by young Jewish men in general, and how proud we are that this isn't a constant occurrence.
One student killed, three wounded at Arizona campus during fight (a)
from the article: Gang suspected of attacks on Arabs in Jerusalem