"Military members dishonorably discharged cannot legally purchase a gun, but Kelley's bad-conduct discharge falls just short of that mark. [[as aj pointed out)
It's unclear if Kelley's assault charges constituted domestic violence, but such a conviction could have also legally disqualified him from gun ownership.
But even if the assault charges didn't technically go down as domestic violence, assault alone can be treated as a felony, which should preclude gun ownership. And even if the charges didn't go down as felonies, the twin charges carried a maximum sentence of over a year in prison, and therefore should preclude gun ownership."

So maybe if we tweak our gun laws to make them stronger, crazy people won't be able to lie or otherwise get their hands on one of the 300M guns already sold? Or the authorities could go door to door collecting guns to see how that would work out. While we are waiting for deliverance, two locals gave chase and neutralized Devin Kelley before he killed more people.