I do think it's worth noting that half of the nation's deadliest shootings ever have occurred in the last five years.

1. April 16, 2007: Virginia Tech campus in Blacksburg; 32 dead + shooter
2. December 14, 2012: Sandy Hook Elementary in Connecticut; 27 dead + shooter
3. Oct. 16, 1991: Luby's Cafeteria, in Killeen, Tex.; 23 dead + shooter
4. July 18, 1984: McDonald's restaurant in San Ysidro, Calif.; 21 dead + shooter
5. Aug. 1, 1966: University of Texas at Austin; 16 dead + shooter
6. Aug. 20, 1986: Post office in Edmond, Okla.; 14 dead + shooter
7. April 20, 1999: Columbine High School in Littleton, Colo.; 13 dead + 2 shooters
8. April 3, 2009: Immigration services center in Binghamton, N.Y.; 13 dead + shooter
9. Nov. 5, 2009: Soldier Readiness Processing Center at Fort Hood, Texas; 13 dead
10. Sept. 6, 1949: Camden, N.J.; 13 dead
11. July 20, 2012: Movie theater in Aurora, Colo.; 12 dead