Sure, there are already all sorts of ways for some fruitcake to attack and kill a number of civilians. However, what disturbs me about the citizen target scenar

Sure, there are already all sorts of ways for some fruitcake to attack and kill a number of civilians. However, what disturbs me about the citizen target scenario that it expands the scope (locations and timing) of what can be targeted and reduces the requirement that the attacker has to be willing to accept a near-certainty of death or capture during the attack. If someone wants to drive a truck through a farmers market or the like, it's pretty hard to stop them. What worries me is that this sort of technology allows that someone to instead to choose to attack something like a concert, public rally or political event with a greater symbolic significance despite a (2D) police perimeter, fences, bollards, etc. It may not increase the casualty risk but it may certainly increase the "theater" potential (which has traditionally been a big part of terrorism - witness the fixation of airports/airlines).