True, but it is still false to say that more guns necessarily means more gun crime. I don't think this chart proves anything, it just shows another perspective of the data.
Another point of interest is the number of CCW issued (estimated to be around 17 million now) and the liberalization of carry in general since the 1980s.
I think there is a point in diminishing returns--some gun control measure are more effective than others--but many places in the US have not even plucked the low-hanging fruit.