Today I listened to Monsieur Pierre on Megyn Kelly's show and he continued his mantra that background checks et al would not help and would only encumber law-abiding people. Well, weren't the shooters in Newtown, Aurora, Virginia Tech, and Columbine (just to cite a few) all law-abiding prior to the murders they carried out?
I didn't have to listen to anyone today I can simply state my opinion that shootings by people are unpredictable and no matter what laws are put in place a lot of this will not change because the examples you listed above are all kids who took there own life...except The Batman kid...