There is only one problem with your theory: people are snapping less, not more. Violent crime is way down. Mass shootings happen at the same rate they did thirty years ago.
http://mobile.boston.com/community/blog ... ass_shooti
Myth: Mass shootings are on the rise.
Reality: Over the past three decades, there has been an average of 20 mass shootings a year in the United States, each with at least four victims killed by gunfire. Occasionally, and mostly by sheer coincidence, several episodes have been clustered closely in time. Over all, however, there has not been an upward trajectory.
http://m.nationalreview.com/articles/33 ... -john-fund
Mass shootings are no more common than they have been in past decades, despite the impression given by the media.
In fact, the high point for mass killings in the U.S. was 1929, according to criminologist Grant Duwe of the Minnesota Department of Corrections.
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In other words, your hypothesis is bullshit.