So what? The racist right-winger who massacred a church-full of blacks was allowed to buy a gun because of the insane laws foisted on us by the nra and its lapdogs. The right-wing nutter, Houser, had an arsenal of weapons he was able to buy under our current gun laws. The list goes on and on.
People who support the insanity of our current gun laws are morally responsible for all of the gun killings that are perpetrated by these extremists.
If someone wanted to kill a church full of black people that badly, they would just decided to blow it up or gone on a murder spree with a knife, or throwing stars, etc if they couldn't purchase a gun. Having tougher gun laws will not prevent deaths from crazy people. Period.