Time to explode pop-psychology kids - let's assume for a minute that violent computer games cause massacres, specifically school shootings because they are usually perpetraded by the target demographic of games players. Then let's further assume that access to violent computer games came with the rise of Windows 95 and the FPS genre.
How do you explain all the school shooting that happened before 1995?
Name - Location - Date - Year - Number of Victims
University of Texas Massacre Austin, Texas, United States August 1 1966 16
SC State killings1 Orangeburg, South Carolina, United States February 8 1968 3
Kent State shootings1 Kent, Ohio, United States May 4 1970 4
Jackson State shootings1 Jackson, Mississippi, United States May 14–15 1970 2
Olean High School shooting1 Olean, New York, United States December 30 1974 3
California State University, Fullerton massacre Fullerton, California, United States July 12 1976 7
Cleveland Elementary School shooting San Diego, California, United States January 29 1979 2
Deer Creek Middle School shooting Littleton, Colorado, United States April 7 1982 1
Parkway South Middle School shooting Manchester, Missouri, United States January 20 1983 2
Goddard Middle School shooting Goddard, Kansas, United States January 21 1985 1
Portland Junior High School shooting Portland, Connecticut, United States December 10 1985 1
Pine Forest Senior High School Fayetteville, North Carolina, United States May 6 1986 0
Pinellas Park High School shooting Largo, Florida, United States February 11 1988 1
Hubbard Woods School shooting Winnetka, Illinois, United States May 20 1988 1
Atlantic Shores Christian School shooting Chesapeake, Virginia, United States December 16 1988 1
Cleveland School massacre Stockton, California, United States January 17 1989 6
University of Iowa shooting Iowa City, Iowa, United States November 1 1991 6
Lindhurst High School shooting Olivehurst, California, United States May 1 1992 4
Palo Duro High School shooting Amarillo, Texas, United States September 11 1992 0
Berkner High School shooting Richardson, Texas, United States November 6 1992 1
Edward Tilden High School shooting Chicago, Illinois, United States November 20 1992 1
Simon's Rock College of Bard shooting Great Barrington, Massachusetts, United States December 14 1992 2
East Carter High School shooting Grayson, Kentucky, United States January 18 1993 2
Fairfax High School shooting Los Angeles, California, United States January 21 1993 1
Amityville High School shooting Amityville, New York, United States February 1 1993 1
Reseda High School shooting Reseda, California, United States February 22 1993 1
Wauwatosa West High School shooting Wauwatosa, Wisconsin, United States December 1 1993 1
Central Middle School shooting Sheridan, Wyoming, United States September 17 1993 1
Margaret Leary Elementary School shooting Butte, Montana, United States April 12 1994 1
Grimsley High School shooting Greensboro, North Carolina, United States October 12 1994 1
Wickliffe Middle School shooting Wickliffe, Ohio, United States November 7 1994 1
And that is just the USA, there are plenty more around the world
http/en.wikipedia.org/wiki/School_shooting