I feel awful for this couple. Things like this can scare you to death and ruin you vacation or they can remind you there is no perfect place in the world and just make smart decisions. I go to Israel each year, I have been going for years during some of the craziest times. I try my best to never put my guard down and be aware of my surroundings. Even in Aruba, (although no west bank) I carry myself in the same manner. Dark areas, suspicious people, flashing cash, leaving things out, assuming that everyone is happy you are on their island are all things that can get you in trouble.