It's pretty simple, really. If someone is travelling in a car at, say, 60 mph and lightly tosses a rock or a brick out the window into the path of an oncoming car also travelling at 60 mph, then if the rock hits the oncoming car, it will hit at the equivalent of 120 mph. Imagine the damage and death that a brick or a rock will do if it hits you in the head at 120 mph. Palestinian terrorists have done this many, many times over the years against Israeli cars (easily identified by their Israeli license plates), maiming and killing many Jews. And getting away with this kind of murder is simplicity itself. Palis have done it so many times. Does anyone still believe in peace with Palestinians?
Netanyahu at Holocaust memorial ceremony: Nazis slandered Jews before destroying them (Haaretz)
from the article: Fatal West Bank car crash caused by Palestinian stone-throwing