You don't fight Crime by increasing the magnitude of deterrents i.e the magnitude of punishment. Evidence shows that this just doesn't work. Changing the punishment from 5 years jail time to 20 years jail time, or from life imprisonment to capital punishment just doesn't work. You can however reduce crime by increasing the magnitude of what people value in life (which translates to an increase in what perpetrators can expect to lose if they commit a crime).
And how exactly do you do this? By increasing economic development and inculcating moral values in a population. Because most things people value are either material or perceived mental states. And an increase in these things will mean a lower crime rate, since people now have more to lose. And so people who value society's perception of themselves and have more material wealth, status, empathy, etc. will be more risk-averse when it comes to committing a crime, since they now have more to lose, in terms of both material comfort and the way they feel society views and judges them.
