Unit 8 --- Whether committing crime should be punished ? ?

The crime has been priority problem which disturb people since the origin of civilian time. Some people think it is necessary to punish the crimer by the government, However, others have opposite opinion.
From my perspective, punishing and stopping committing crime is government's duty. Since crimes are inevitable, they need be controled and limited, and the most efficient measure is punishing the people who has already committed crime. On the one hand, those people will regert for thier crime than reform themself, on the other hand, other potential crimer who may have such evil desire would be warned, then give up.