There is no statistical correlation between severity of punishment and reduction in crime rates. To recommend extravagant punishment based on emotional response is ignorant, ineffective, and barbaric.
Many prison systems around the world make the problem worse, not better. The 'lock em up and throw away the key' mentality makes it politically incorrect to spend money on making the prison system a true institute for reform or for enforcing basic human rights; as a result prisons become festering hovels of veneral disease, violence, rape, and psychosis. The entrenched abuse, extraodinarily hostile living conditions and constant exposure to violence all require the suspension of morals and the subjugation of the conscience. The result: when the prisoner emerges, he is hardened by his experiences and has nothing but contempt for society, in many cases, he is more dangerous than he was before.
Having emerged from prison, the recently released offender finds himself categorically excluded from mainstream society. He is the first to be screened for job applications and the first to be denied for loans, credit, or any sort of financial aid. Although this does not excuse a return to crime, it is a contributing factor: the inability to reintgrate into polite society.
A retributive justice system and an excessively punitive prison system is a breeding ground for sociopaths. A legal system based on vengence and torture has no moral or principle-based authority, and the people instinctively know this. The law derives its real authority from its ability to strive to uphold justice: when it is influenced by rage and retribution, it loses this authenticity and becomes an arbitrary structure to be heeded at the citizen's convenience.