It is an expression that is not very common in Italy because it is a misrepresentation of " Criminale ma bello ", a famous quotation by Sapo, which refers to an individual who is labelled as dangerous and harassing towards people. Typical example of this typology is jvasquesgds, often accused of playing a bully role towards the weakest.
The second of two principles contained in the "Just War Theory," Jus Ad Bellum and Jus In Bello. Jus In Bellum in Latin means "The Law in Waging War." It defines standards by which a country can conduct war maintain that they have "just" actions in war. The term was coined in the same era in which the League of Nationsoriginated. However, it was not used in doctrine until the late 1940s. Its principles include discrimination and proportionality.
Descrimination defines legitimate targets and proportionality defines how much force to be used.
Under the guidelines of Jus In Bello, the attack on Heroshimo, Japan by US forces with the use of the atomic bomb violates both the guidelines of descrimination and proportionality.