Then who is tasked with delivering justice to the victims?
I guess there are some edge cases. Drug smugglers for example are probably aware of the rough probability of detection and weigh it up against the length of jail time. But I reckon Sarkozy thought he'd just get away with it and didn't even consider what the potential punishment would be.
It's worth considering then that the next person who has the option to do this might behave differently, given Sarkozy has not got away with it.
You're implying that imprisonment makes people offend more - perhaps the simpler explanation is that most criminals will commit crimes when they get the chance, especially prolific criminals. Prison takes them off the streets and stops them victimising more people - this is helpful.
* An honest acknowledgement of ones behaviour and its impact on others.
* Accepting the consequences of your behaviour, whether legal (such as going to jail), financial, or personal.
* Taking the initiative to make amends where possible.
* Taking steps to improve oneself and/or prevent the same behaviour in future.