I think that people also have the tendency to think that bullets can penetrate, well, people, but not things. Think of how many cop shows you see in which a cop hides behind an open car door while a ton of bullets slam into the door, magically stopped by the (reinforced concrete?) door, leaving the cop in safety to shoot around the sides. In real life? Most of the bullets would go right through the door and kill him. You see all sorts of articles about people shooting a bullet in the streets and it going through brick or siding to kill a kid sitting inside the house watching TV or doing homework. People just don't realize that bullets penetrate stuff like brick, siding, wood, cars, etc. and that they travel for a *long* distance without stopping.