The most effective protection against such disasters is to prevent such people possessing guns. There is no reliable test for the propensity of any individual to turn into a mass murderer: so the only practicable policy is to prevent individuals holding guns in their homes.
Those who want to use guns should be limited to using them on the premises of gun clubs. It should be illegal to take guns off the premises of such clubs, so the police could arrest anyone possessing a gun outside a club.
The clubs should be required to provide genuinely secure storage for their guns, and should be made legally liable for any injuries or deaths caused by the guns they own; and they should be required to insure, like a car owner, against claims for such damages.
Those who wish to entertain themselves with lethal toys should be willing to protect the community from their destructive use.
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