"Enough is enough!" "This can't go on!" "This has to stop!" These were among the comments that came through the blizzard of commentary after the massacre at Marjory Stoneman Douglas High School in Broward County. We have heard these words before. Unfortunately, such atrocities are not going to stop. For the ingredients that produce such slaughters are present and abundant in American society. And what can stop a man full of hate, who has ceased to care about his life and is willing to end it, from getting a weapon in a country of 300 million guns and killing as...