You look at jurisdictions that are "soft" on crime - Scandinavia, New Zealand etc. and invariably all of them have figured out non-punitive methods of crime reduction that are far more effective than jail. This is reflected in crime statistics.
(and before you mention Singapore, it's worth pointing out that they have many, many policies in place to alleviate poverty and social unrest - government housing, world class education, a strong economy, national service etc. in addition to their strict laws. I'm not arguing that the laws do nothing, but you can't just beat an uneducated, poor, fatherless person with a stick and expect them to be a productive member of society.)