" It's always useful to make lists, ranked by either occurence or severity, single out each, one by one, trace the pathways of each fallen 'domino', and make active efforts to make sure each preceding domino stay upright. It is unfair to smash the last domino, just because we can't clearly see how they fell to begin with.
With regards to crime, those who have enough food, acceptable shelter, and ability to acquire basic status and recognition within immediate groups - may be less prone to violence and crime. Though there are other reasons for crime to occur, it is often related [in one way or another] to physical, mental, social or economical wellbeing.
Crime is desperation, actions of distress. Violent criminals may not be angels, but reality is, their state of mind very likely gradually became less and less empathic due to their subjective experience of society's inability to recognize the real need for greater stability within certain communities.
It may be easier said than done, but small efforts to raise the poverty line, projects and development - showing that society truly cares, may be the only viable solution. Employing good rolemodels [in the right places] may be especially effective.