Jim weighs 218 pounds, his teenage son weighs 119 pounds. To lose weight Jim goes on a diet and exercise plan and loses 20 pounds. However, he still weighs more than his son who spent his time updating Facebook. Clearly diet and exercise don't work. A year later Jim has put the weight back on and is taking multiple medications; unfortunately, he still believes in diet and exercise so he practices the same regimen but this time puts on 5 pounds. Diet and exercise are a scam. Chicago has the highest murder rate and the strictest gun laws in the nation. Gun laws don't restrict violence.
In case this is one of the papers Sarah Palin reads, I should connect the dots. Obviously these aren't scientific studies, but if they were, you wouldn't compare Jim's weight to his son's or fail to account for the potential effect of the new medications. The information about Chicago tells us that lots of people die in Chicago; that's it, nothing about the efficacy of gun laws. To do that you have to look at the rate of change in gun violence in Chicago not compare it to other cities and you have to account for potentially hundreds of variables such as guns shipped in from other states, etc.
You can look at statistical studies on gun violence at the John Hopkins website or read their book. I must warn you, these are not Rush Limbaugh approved studies so you may get cooties.