The worst thing about wanting to find a solution to school shootings is that everybody already knows whose fault it is (mostly based on their tribe). Everyone knows what they want and don't want as a solution and no one is willing to do a nuke level critique and really find a solution that works. There are a thousand switches that had to close to make this happen and opening just one would have stopped it (think electricity or water flow). The secret is to find the switch that prevents the most tragedies (not just school shootings if possible), is easiest to implement and that is the least intrusive compared to potential results. But nobody wants to look because they already know which switch they want (or at least know which switches they are interested in and which are off limits).