Some people carry a .32, because they know they can't handle, or accurately shoot a bigger gun. If I were an 80 year old women of 110 lbs., I'd feel a whole lot better with my little .32 than nothing at all, or with a gun that was too big and heavy for me to do anything with.
We all would like to think that when the moment of truth arrives, we'll whip out ol'wonder and blaze the other guy into a red mist and a whimper. In reality, most of us will never have to face that day, but for those that do and can't handle a big gun, a "little".32 will probably feel a whole lot better than getting killed or raped.