Or as an equalizer even if the other person doesn't have a gun. Women protecting themselves from men with violent intent. Normal to smaller sized men protecting themselves or others from larger, stronger, men with violent intent. If you're giving up 40, 50, 70 to 100 lbs in size, differences in fighting skill level, muscle mass differences, to someone - or dealing with someone hopped on on PCP or meth - you're going to need something to close that gap and close range weapons like a knife, bat or something aren't always practical or helpful.