With that logic why wouldn't the terrorists use more vehicular manslaughter? It's effective right? It worked within the U.S., why wouldn't it work in a country with less security? The casualty rate would also be higher than shootings can ever be. Fly a plane or two into the tourist hotspots and BOOM, thousands of people dead, many more injured. On the topic of gun laws and planes. YOU CANNOT have guns on planes unless it's locked up or you're an air marshall, otherwise you're basically defenseless. If CC were allowed on planes 9/11 would have been a different story.