The funny thing is the last graph he posted there was a concurrent OVERALL decline in violence in the rest of the states (pink line) as the right to carry gun laws were instituted which i presume is claiming to have had an affect on crime. So effectively there is very little correlation.
A couple of things:
These graphs show that in states with gun bans, they were completely ineffective. Also, these graphs also show that since the Right to Carry has been established, the crime rate has been lowered to match or go below the national average with a continual trend downward.
What does this mean? This means that allowing citizens to own and carry guns DOES NOT increase murder rates and it shows a trend of keeping within or below the national average so what would be the point of restricting this freedom?
As you can see, there would be absolutely no point. THAT is how you interpret these graphs correctly.