The Texas tower sniper tragedy took more lives:
Charles Joseph Whitman (June 24, 1941 – August 1, 1966) was a student at the University of Texas at Austin and a former Marine who killed 16 people and wounded 32 others (a total of 49 victims including himself) during a shooting rampage on and around the university's campus on August 1, 1966.
http://en.wikipedia.org/wiki/Charles_Whitman
William Bonin, John Wayne Gacy and Jeff Dahmer (google around for many, many more) killed lots of people. Let’s outlaw homosexuality.
Whitman was kept pinned down by the erratic return fire of citizens with deer rifles. If it hadn’t been for the citizens, Whitman’s number would have been much higher. I watched the incident on live TV from the Austin feed.