It's easy. You raise someone to have no respect for life or property, teach them that they are takers and everyone else is prey, and then back it up with a toothless criminal justice system that reinforces their beliefs that there are no consequences for their actions. They are not deterred by jail, its a badge of honor.
Both the carrot and the stick are much too small at this point. There needs to be help for those who will take it and an execution for those who won't.