Arabs do the same thing in Jerusalem and other parts of Israel. Its a conflict and people get hurt. The world is a nasty place and is not a liberal utopia. I don't condone the ganging up on a single person because I think its cowardly, whether by Jews or Arabs, but Arabs do the same thing. Why don't you ask where Arab parents are when ten year old kids are sent out to stand at a street corner in groups and throw rocks at random Jewish cars. Then you could say "Where are their parent?" Then to your logic maybe Arab parents are busy waging Jihad and blowing themselves up. Thats how stupid you sound.
from the article: Gang suspected of attacks on Arabs in Jerusalem