John99, I take it that you don't hunt, in the ideal situation you may only need one bullet, but as in real life nothing in hunting goes perfectly all the time, multiple magazines make it more fun when you go out to just have a day of shooting fun, there are many game that are played by the shooting community, I do NRA high power rifle, and pistol, which require magazine changes in the course of fire, I am a member of the Single Action Shooting Society, and use the firearms from the Old West Period from 1847 to 1899, and I do Combat Action, which again requires multiple magazines changes in the course of fire, and some times I just grab a bunch of milk jugs and go out to the country and have a day of fun target shooting which is far more fun when you are not always stopping to reload a magazine, so there are many reasons to have more that a single shot or magazine for shooting, the least of which has anything to do with paranoia.