Tazers don't always work, either. Study Casteneda and learn how a warrior avoids danger (lots of luck on that). Carry a gun and the one time you think you need it will probably be the time you mistake Mother Theresa for a mugger (that's what would probably happen to me). The gun you thought she had in her hand will be a crucifix she was using to bless you. If it were a real mugger, your gun would jam. At least, that's what would happen to me. Ever hear of the law of dynamic negatives?