I have attended many rallies and we never threw rocks at the police or army. What these Arabs engage in is rioting. This young man was active in a riot, so he did not have rocks in his hand, but if a rock killed a innocent bystander or a policemen those present would be accomplices for cheering them on and not trying to stop the attack on the authorities from taking place. If this guy was home studying instead of attending a riot, he would still be alive.
Saudi police officer shot dead in the east of the kingdom (AP)
from the article: IDF to probe death of Palestinian protester at West Bank rally