This is far more complicated seeing these people claim to be activists, are are mostly civilians. Both scenarios are completely different. If Israel wouldn't be a moral country, it would simply use its lethal arsenal. The whole thing would be over within minutes. Israel has to deal with these "activists", prevent them from storming the border, WHILE AT THE SAME TIME, not cause any casualty. If one person gets hurt by a water cannon, the whole world will forget about the 9000 massacred civilians in Syria.
Police arrest 18-year-old Palestinian suspected in Old City stabbing (Haaretz)