You have just illustrated how people are too dependent on wireless technology. It seems anyone under age 30 can't seem to function without their wireless devices. Before the cellphones people would react for self-preservation and defend themselves instead of waiting for tech and public service to "save" them. And before this devolves into a gun debate I believe that there both needs to be rights to carry as well as stiff penalties when you do draw down on someone. The personal responsibility needs to be just as high as the potential risk/threat.
Before cell phones if an armed maniac was in your building and you didn't have a weapon (either prohibited by law as it is in many states or you simply didn't have one), you'd hide in a closet or something and hope he didn't find you.