An American problem?

Emsdetten, Germany, November 20, 2006:
18-year-old Sebastian Bosse entered Geschwister Scholl School and used a firearm and a smoke grenade to injure 37 before committing suicide.

Erfurt, Germany, April 26, 2002:
19-year-old Robert Steinhauser used two firearms to kill 13 teachers and 2 students before committing suicide.

Zug, Switzerland, September 27, 2001:
Friedrich Leibacher entered the canton's parliament and shot dead 14 politicians.

Osaka, Japan, June 8, 2001:
37-year-old Mamoru Tukama, former janitor, killed eight children using a kitchen knife and seriously wounded thirteen other children and two teachers before being captured. He was eventually convicted of murder and put to death.

Port Arthur, Australia, April 28, 1996:
28-year-old martin Bryant killed 35 and wounded 37 at the popular tourist destination of Port Arthur.