Criminal histories and documented mental health problems did not prevent at least eight of the gunmen in 14 recent mass shootings from obtaining their weapons, after federal background checks led to approval of the purchases of the guns used.
There you go. So despite background checks, these animals still killed people. The rules today are much tighter than they used to be. Tighten them down even harder if you want to. As for me, I want my kids to take the CCW classes and protect themselves because in the end, they're the only ones who can.
I will tell you that if I was somewhere and saw a violent crime being committed, I would not waste a second to pull a gun on the bad guy and blow him away to protect myself, my family or any other law abiding citizen.