It's not something I have heard someone say. This came from over 60 years of experience and life. Bombs need no education to make, instructions can be found on the internet quite easily. With a good knife it would take very little effort and getting close does not seem to matter to people who are inclined to kill. A vehicle can be used on any city sidewalk quite easily as Europe can attest to. Removing a method of killing will not stop the destruction of human lives, what is needed is a way to make life mean more to everyone. I have had access to guns my entire life and have never murdered anyone as have the majority of people in the world. If the reasons people kill others were somehow removed then the killings will stop.