carrying is shown to be good for every one, except for the bad guy. Most of the time you carry your gun you don't need it. I bet the people in these videos are glad they didn't leave their gun home that day
Fingerprint readers on your gun and you're safe can be disabled with EMP. This video shows EMP gun made for law enforcement.. but you can find a kid on Youtube made one with a camera criminals can make or have a smart kid make one. and also see how easy a common gun safe can be opened with a plastic pen.