The limitation to carrying any kind of weapon, whether it’s a gun, knife, mace, tazer, etc. is that the person must be able to have a moment in which to utilize the tool. After reading so many books and cases about crimes such as this, the sad reality is that the victim is often taken by surprise, so even if they had a gun, they can’t access it. A person can overpower you very quickly if they have the element of surprise on their side (add speed, and greater strength, etc. and it is even better). I just wish more people were paying attention. These young kids (not this gal) are walking around talking on their cell phones and are totally oblivious to their surroundings; very, very dumb and naive.
Awareness of one's surroundings is the paramount first step in personal safety and protection, that's true.