Regulations I would support:
1)The Sandy Hook, Aurora, Clackamas shooters and the like needed a way to transport themselves and their firearms to their targeted location. There would of been no way they would have been able to walk around in public carrying longarms without attracting attention. So perhaps mental screenings during the process for the Driver's license or State ID might be a viable solution. The 2nd Amendment isn't affected and the anti-gun people share the same pain.
2) Secure storage, where the government adds new jobs by manufacturing US made firearms lockers made to gov/mil standards, at affordable prices for the average joe.
Victim: A hapless individual who waits for third party intervention and/or gambles their life on what little good remains in the heart of their attacker.