If you were to look at a list of the "Top US Mass Murders," something like 24 out of 25 have occurred since 1973, with only one occurring before. 
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Think about that. Not even the Wild West with the Shootout at the OK Corral and with all the outlaws like Jesse James, Billy the Kid, Butch Cassidy, and the Sundance Kid makes the Top 25.....or comes close to it. 
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Guns were just as prevalent in the Wild West, perhaps even more so, and yet the "culture of death by mass murders" is a relatively new phenomenon that has risen since 1973.....and is, unfortunately, becoming more common.
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The problem is not as simple as "too many guns" or "too few gun laws" but may be as simple as "we've raised more than an entire generation believing that 'murder for just-because' is defensible and honorable."