To the contrary, my plan is to make deliberate murder, or manslaughter of an innocent while attempting to commit murder a capital crime requiring the death sentence. That sentence to be carried out in public within one year of the conviction. Hang the perpetrator in his own neighborhood.
Mass murderers who die on the scene, should be publicly dumped into a garbage truck and hauled off to a landfill. His/her relatives could retrieve the body there, if they desire to do so. If the mass murderer survives, he should be put in chains and dragged off to jail through the streets where he can feel the wrath of an enraged community. Mass shootings would become rare.