The single biggest root cause is the ACLU. They threatened Regan and he began the release of the loon’s from the looney bin.
There are plenty of others and the bulk point back to the liberals.
Hell, Obama is trying to kill us all in the latest Ebola crisis. The libs are the embodiment of the devil himself.
I think an interesting analysis would be to plot the number of mass shootings alongside the growth of “gun-free zones” to see if there is a correlation.