 It arose through the application of the idea of common purpose and has been applied by the International Criminal Tribunal for the former Yugoslavia to prosecute political and military leaders for mass war crimes, including genocide, committed during the Yugoslav Wars 1991–1999.For example, "if three people commit a bank robbery and one fatally shoots a person in the process, the law considers all guilty of murder".The concept of "collective liability" where more than one person can share liability and punishment for the actions of another person is not universally accepted and is considered by some to be a form of human rights abuse, while others believe it is just.