Americans are for the most part are a wild eyed, conviction riddled, Facebook informed, angel believing, capitalist driven people who, even with an unlimited amount of training, still make bad decisions over and over and over again.
There’s simply no amount of training in the world that will regulate this, just as there’s no amount of training that will eliminate law enforcement from killing black people.
The problem is not the guns, absolutely. The problem is the owner of said gun who can no longer be helped.
However, when said person cannot be fixed, the next thing in line to go is the tool.