If you want to have some fun, Google armed citizens defending themselves with their gun. A lot of conflict, but the legitimate raw data is an eye opener. First, let's consider the armed citizen entering into a shooting such as a mall,movie theater or school. This is not an off duty police officer so very rare. In 2015 only reported 2 times this occurred. 2014, 1 time. 2013 none. 2012 2 times. No more until 2009. So much for carrying around 40 to fifty bullets, but under those isolated events, probably a good idea. Personal choice. Now the meat of this thread. The NRA reports an estimated 2 1/2-3 million episodes a year where a firearm was used in self defense. Not necessarily fired, but was used for personal defense. This number was arrived from a study, as many polls are, from a random sampling of a few hundred people and the interpolating for the U.S. population. Of course, these numbers are debunked by the anti gun crowd. But in so doing, they said in quoting stats from the National Center for Violence, the number was "only" 67,740 events a year average for last five years. I don't know about you, but almost 70,000 times a gun was used for personal protection is reason enough for me to carry concealed and keep one or more in close proximity at home. Here's another one from Manhattan DA David Koppel for a study for the National Crime Victims Center. When a robbery victim doesn't defend himself 88% of the robberies are successful and the victim is injured 25% of the time. When using a gun to defend themselves the number drops to 25% success rate and injuries down to 17%. So the odds of engaging a terrorist or mass shooting is rare. But protecting yourself, in a direct confrontation, not so much.