No, I'm not talking about the two faced/fork tongued politicians, but instead the sharp divide in violent crime. Basically, in Chicago, you either live in a really nice neighborhood w/ little crime or you live in a craphole. There's few in betweens. Take a look at this map of homicide changes over the last decade:
For the most part, the neighborhoods that were dangerous got more dangerous. The ones that were safe, got safer. The NY Times put out an article on totals over the same period. It correlates almost exactly.
Now take a look at the trend of those who registered firearms following the McDonald case (no longer necessary w/ the new CCW law) Image via John Lott:
So crime doesn't correlate to legal firearm ownership but instead to lower education and poverty levels.