Violence is not increasing, it is decreasing. The US is at a 40 year low for violent crime. http://www.nytimes.com/2011/05/24/us/24crime.html
Gun crime has been dropping in the US (like everywhere else) since the 90s, which is when Americans started the push towards more CCW rights. Are they related? I would say they've helped, but wouldn't be the major factor. Correlation doesn't mean causation.
The fact is though is that there are more guns in the USA than ever before and gun crime has fallen. Gun crime has many more factors than merely the availability of guns.
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