Free-Market Solution

Free-market solution: Sue the shooter's family, the University, the NRA, the Isla Vista police department, and every single vendor that sold him a gun for damages. Do the same with every mass murder until liability insurance is required for gun ownership. Then let the insurance companies tell gun owners what they can or cannot have.

Looks like Tom Tomorrow called it: "The occasional horrific civilian massacre is just the price the rest of us have to pay. Over and over again, apparently."