All of these back and forth arguments are missing the real issue. These mass shootings get all the press but the real problem is the day to day shootings in the cities. There are shootings nearly every night in certain areas of Baltimore and other older cities. Just because some nut legally buys a bunch of guns and shoots up a college campus, it has little to do with the daily firearm carnage going on all over this country. From Wiki:
Sensible gun control measures is not a cure-all but can go a long way towards beginning to curb future gun violence.According to the Centers for Disease Control and Prevention, in 2013, firearms (excluding BB and pellet guns) were used in 84,258 nonfatal injuries (26.65 per 100,000 U.S. citizens) and 11,208 deaths by homicide (3.5 per 100,000), 21,175 by suicide with a firearm, 505 deaths due to accidental discharge of a firearm, and 281 deaths due to firearms-use with "undetermined intent" for a total of 33,169 deaths related to firearms (excluding firearm deaths due to legal intervention).