Because I like to shoot a lot of **** without having to reload. Because it is fun. Because I live in a state where drug cartels roam and it is nice to know I have a 31 or 33 rounder in my back pocket just in case I run into something or someone out in the desert and can't get to my rifle. Because it is fun to shoot multiple targets with a hicap mag.
Some people would ask the questions:
Why do you need a firearm unless you are a hunter?
Why do you need a firearm at all?
The thing people are failing to realize is that scumbag was NOT a firearm owner nor was he interested in firearms. He was a crazed murderer interested in killing. I know three places in tucson right now I can go and buy a black market weapon for cheap. If he wanted it, he could have gotten it. If he had ten rounds, he still would have shot that woman in the face and killed others.