We have tried a federal assault weapons ban, several states have implemented state-wide assault weapons bans. They don't work in preventing mass or school shootings.
So no matter who, or what credentials they seem to have arguing that we should ban any form of assault weapon as a means of stopping even a small segment of firearm violence is at least according to Einstein........INSANE.
I have no evidence so this is just personal opinion.
The Democrats do not want to solve this school shooting stuff because it furthers their agenda of banning and disarming the citizenry. I believe they actually support this gun violence and encourage it whenever they can. I would not be surprised if they caused it to happen.
Their only solution is banning guns, even though it will not solve the problem at hand. I believe they are, if nothing more sinister, complicit in these act of violence.