Here is a great control law that the Congress can pass. The law will be one line and simply read. "If you are one of the people who is identified in this video, you shall, under no circumstances be legally allowed to own or carry a firearm of any sort" We need better vetting and the people who are in this video have clear psychological issues.
You know who has lots of guns but a far better record on violence with guns? Canada. Have a look at their firearm license application. A little detail but an interesting one.