A JOKE? You mean they can't learn from western free society

like these;

The Columbine High School massacre (often known simply as Columbine) was a school shooting which occurred on April 20, 1999, at Columbine High School in Columbine, an unincorporated area of Jefferson County, Colorado, United States. Two senior students, Eric Harris and Dylan Klebold, embarked on a shooting spree in which a total of 12 students and one teacher were murdered. They also injured 21 other students directly, with three further people being injured while attempting to escape the school. The pair then committed suicide. It is the fourth-deadliest school massacre in United States history, after the 1927 Bath School disaster, 2007 Virginia Tech massacre and the 1966 University of Texas massacre, and remains the deadliest for an American high school

[link to en.wikipedia.org]

or from these [link to listverse.com]

OH SORRY, all those massacres were not due to a JOKE!