Some "solution."  

Too many gun owners in the U.S.; this would likely destroy the nation's economy and give it third-world status.  (There is some evidence to strongly suggest that if--by magic--drugs were successfully banned in the U.S., the same economic result would occur.). 

Number of households reporting possessing a gun: 
2014 42%
2015 41%
2016 39%
(Statista). Diminishing? Maybe.  How many homeowners lie when asked?

Evidence that gun violence is becoming progressively worse in the U.S. 
2014: 273 mass shootings; 12,569 deaths from all shooting incidents
2015: 333 mass shootings;  13,501 deaths from all shooting incidents 
2016: 383 mass shootings; 15,079 deaths from all shooting incidents
YTD 2017, 277 mass shootings; 11,883 deaths from all shooting incidents
(See all the statistics at the website of Gun Violence Archive, a US non-profit organization. The archive defines a mass shootings as 4 or more victims NOT including the shooter.