You can generalize the situation to a graph with year on the x axis, and something like kinetic energy available to an individual on the y axis. So in ancient t

You can generalize the situation to a graph with year on the x axis, and something like kinetic energy available to an individual on the y axis. So in ancient times, you'd have chariots, then mounted Knights, then cross bows, then black powder weapons, then automobiles, modern firearms etc. recently jumbo jets (9/11). In the current era, Elon musk is an individual with access to essentially ballistic missiles. This analysis illustrates that lots of things can be used as weapons, and as using vehicles as weapons indicates, gun control has limited effect if some one really wants to hurt people. Extrapolating to the future, long awaited flying cars could be another bump on the curve due to much higher velocity and kinetic energy than a terrestrial vehicle. Then there was the character in Snow Crash that had a nuclear warhead he carried around wired with a deadman switch that set it off if he died. See also techno anarchism.