Guns vs Gun Control & Murders

A pithy stat I stumbled upon this morning:

The United States is 3rd in murders throughout the world. But if you take out Chicago, Detroit, Washington DC and New Orleans, the United States is 4th from the bottom for murders. These 4 cities also have the toughest gun control laws in the United States. All 4 are controlled by Democrats.  

It would be absurd to draw any conclusions from this data – right?

(Source: Give Us Liberty)

To the staunch gun control, anti-2nd Amendment types out there, it's your assignment to objectively disprove this statistical assertion.

"To put it bluntly, self-defense is the first law of nature; when good people have the freedom to carry concealed firearms, society gets safer." Milwaukee County Sheriff David Clarke, Jr.

"American liberty depends upon the ballot-box, the jury-box, and the cartridge-box." Frederick Douglas, "The Life & Times of Frederick Douglas" (1881)