I maintain that the best way to prevent future mass shootings is to help better educate the public on the possible warning signs that a person may be at risk of planning to commit a violent act, and encourage them to act and do something about it if they see a friend or family member demonstrating those signs. Nine times out of ten, these shooters were noticeably disturbed people who clearly demonstrated those warning signs, their friends and family KNEW they were dangerous, and yet nobody did anything until it was too late.
For a real life example of how this principle can indeed prevent future shootings, some months after the Aurora movie theater shooting, another disturbed man's family began noticing him acting suspiciously, and looked into it a little deeper. They discovered he was planning a similar movie- theater shooting at the midnight premiere of 'The Twilight Saga: Breaking Dawn, Part 2.' So, they acted. They called the cops, told them what they knew, the guy was arrested, a potential mass shooting was prevented, and God knows how many lives were saved.
Why have ideas like this never occurred to the DUmmies?