Just another day, WOW ~ you're good! You've compiled an amazing list.
I'd toss in Columbine. Remember George Sodini? He's the guy who shot up the fitness club in Pittsburg. There's also Michael McLendon in Alabama.
And, I encourage you to make the additional nexus to the underlying domestic violence in most of these cases.
If courts are more vigilant in prosecuting cases of domestic violence, most of these guys would be in prison or in mental hospitals rather than engaging in shooting rampages.
Isaiah Kalebu didn't use guns to kill his victims. He burned down a house and strangled people.
He and the DC Sniper both "slipped through the cracks" of the criminal "justice" system in Pierce County when they should have been prosecuted and imprisoned for domestic violence. Ditto for Isaac Zamora up in Skagit County.
But, what do we expect in a place that looks the other way while Tacoma's chief of police shoots his wife and himself in front of his kids? Ed Troyer knew or should have known what David Brame intended to do that day, but he did absolutely nothing to protect Crystal and her kids. Yep. That was a gun the chief of police used. Service revolver.
LOL ~ now that I'm on a roll ~ did you know that most people who are murdered with a gun are shot by somebody they know intimately? Family member or close friend.