There are just not that many people carrying, not as many as the author made it sound. A lot of bad $h!t has happened, and yet nobody responded with return fire (think Aurora theatre, where there were service members in attendance). The armed populace just isn't what people think it is, definitely a minority.
Most of these shootings take place in free kill zones, aka "gun free zones". The shooters pick these locations because they want to impose their will without armed resistance.
Liberals never met a slippery slope they didn't grease.
-Me
I wish technology solved people issues. It seems to just reveal them.
-Also Me