I'm not implying causality at all; in fact, my entire point has been to show the exact opposite, that rights (or objects, like guns, the acquisition of which stems from a right) don't cause behaviors. I have the right to eat dirt and drink toilet water, but I don't do either, because neither would be quite right.
So, in Chicago and London, where the crime has been on the rise, a reasonable person cannot blame the increase in crime on guns (esp in London's case, where it would be easier to get your hands on the Ark of the Covenant than a gun).
So, if not guns, what about other policies (welfare, immigration, maybe even other, less controversial etc.)?
(re: rant) Leftists have good ideas (protect the environment, take care of helpless people, etc.), but most leftist ideas require a bigger government and more taxation, as a means to implement them. As a result, government grows, and, because government is itself not governed by the markets, it is by nature inefficient[1], which means it eventually becomes a bloated mess (which can also lead to rising crime, etc.). Acquisition of power eventually becomes the end (see Stalin's Soviet Union, Moa's China, Castro's Cuba).
1. https://en.wikipedia.org/wiki/Efficient-market_hypothesis