well..... Punishment is something which is given to reform a person. The More serious the crime is, the more serious is the punishment. Please refer to what is said in any religion.. repenting and realizing ones fault itself is a wash for ones crime. In the instant case sanju had already realized his mistake, he is feeling very sad for his act. Not to forget, he has been always honorable to the court, law of the land and the police and cbi investigations. he did not run away the scene. he is a complete changed man. Not only did he spend 16 months in jail already, he has been going through hell all these years just worrying about the future verdict of the case. This worring and mental stress itself is a serious punishment. After being in trial for so many years, he will never ever even dream of ever looking at any weapon in future. this is clearly indicated in his latest movie of Gandhigiri and which movie is also liked by all the people in the country. So, what more punishment is left for him? There is some evidence gathered aginst him to proove something. But so much punishment for such a small mistake ..... is a question left to the judiciary.