Yes, just take away all those guns said the liberals as the nutcases get into their vehicles and mow down scores of people. About ten years ago I told my wife that absent firearms, Islamic killers are simply going to use other methods i.e. motor vehicles.
Killers are going to kill. There is no way to stop most adults from getting a gun legally, going to a well populated place, and start shooting people. They can also get into their vehicles, find a well populated place, and start mowing people down.
If some people start showing up on public media like this nut and boast about their firearms, maybe the authorities can doing something about them.
We do not as yet know enough about this nut as to what has been done to treat him.
Nevertheless, there is almost no way to stop someone who is intent on murdering mulitple people by any means available. The task is to try and identify and treat these people before they go off.
General gun confiscation is out of the question. An unarmed populace means leftists eventually take over. Then the great slaughter really begins.