I've always thought about it as a potential terrorist attack vector. It can be done remotely (from afar) and your target is unlikely to understand what's happen

I've always thought about it as a potential terrorist attack vector. It can be done remotely (from afar) and your target is unlikely to understand what's happening (vs. say a stabbing event). It might be because terrorist events are about spreading the terror more than the damage itself. Still, it is a worrying thought that you could be walking the metro one day and an evil person can decide to end your sight.