That's not the purpose of the justice system per se, though I don't see any problem with someone offering criminals, in the spirit of charity, opportunities and help in turning away from criminality toward good ways of living. (Obviously, they must be willing, and we shouldn't delude ourselves into thinking criminals are victims.) However, justice implies that retribution and punishment are merited, and if merited, then legitimately inflicted. If it didn't, mercy and forgiveness would be meaningless. Indeed, crime and evil actions would cease to have any substance. A justice system that does not punish in a manner that is commensurate with crimes committed is no justice system at all. The word "retribution" for some reason offends modern sensibilities. Part of that stems from what appears to be the false belief that retribution entails hatred, which it does not.
If there are flaws in the justice system because either the punishments for some crimes are excessive, or innocent people are being convicted at high rates and possibly because of perverse incentives, or whatever, then those things need to be addressed. But I do not support a generally lenient attitude toward crime in the spirit of Norway's treatment of Breivik. That that unrepentant criminal is alive and in relative comfort is a sickening insult to his victims.