Isn't that demonstrably untrue?
The reason that Americans own twice as many guns as we did in 1990 is the Clinton Administration rhetoric and the Obama Administration rhetoric that caused people to fear that their right to buy a gun might be abridged.
The NRA does a lot to facilitate gun ownership , and they carry advertisers in their magazine, but they have never had a drive to increase the numbers of guns owned by the public by a factor of two.
The increasing population does not explain the rise in gun ownership , the population has not increased nearly that much .
The need of gun manufacturers to sell does not explain the total , surplus military guns from Greece and Turkey and Russia have become hot sellers because they are more economical than new guns .Turkish gun makers are selling increasing numbers of new guns which include some surprisingly high quality . But surplus Guns and guns made overseas do not have any clout with the NRA , they are in demand because the ability of the US gun manufacturers has fallen far behind the demand.
Thus everyone that wants a gun has two , and each of us that wants two has six, this is a net increase in the national wealth that will be quite durable as most guns last fifty years or more.
The co-incidence of decreasing crime rates in every category might not be caused by the increasing gun supply , but it surely does demonstrate that an increasing gun supply does nothing to decrease public safety at all.