I just read an article on Jonelyn.com that may be of interest to you. This article presents facts regarding a possible explanation for the 400% increase in mass shooting incidences across the country recently. They point out that some groups believe the ease of attaining guns is to blame, while others think it is the lack of gun availability. However, their idea is that the increase is related to the increase in depressed individuals in the country, as evidence relating to antidepressants shows.
Read the full article here:
The REAL Reason For The American Mass Shooting Problem