Like most adults I've had very little in way of fights and violence in my life. No, Muay Thai class does not count. But every close call I've had, every heated moment and "wow, dude, i though we were going to have to throw down for a minute" event in my life has come in a bar.
So naturally, such a conflict-filled place is the ideal environment to introduce guns!
Way to go Arizona! Other States just start bar fights. Arizona finishes them. With gunfire.