Is sometimes required to deter law violators and serve as an example others violating the is a part of Classic School thought?

Yes, the idea that punishment is sometimes required to deter law violators and serve as an example to others is a core tenet of Classical School thought in criminology. Classical theorists, like Cesare Beccaria, believed that individuals are rational actors who weigh the potential costs and benefits of their actions. Therefore, swift, certain, and proportionate punishment is seen as the most effective way to deter crime. The public nature of punishment, serving as an example (or "general deterrence"), is crucial in this philosophy.