It is very plain. Gun control is the greatest failure since Prohibition, because the Criminal does Not Care if his stolen firearm (or traded for Illegal drugs, same story) is 'illegal' in a school or anywhere, because he is GOING to break the law. The Armed citizen stops a crime by these criminals about two Million times every year and if every parent that ever entered a school was armed, there would be Zero shootings because the criminal goes where the sheep are disarmed.