You lost me at "may have". Speculation is hardly fact. More likely the Empire of Japan did consider an invasion, but think they likely feared the logistical nightmare of it rather than a band of civilians with guns. The Japanese Infantry was a well trained, well geared, tough as nails, and fanatically motivated fighting force... I hardly think a armed civilian mob could stand against them.
Lots of great arguments for gun rights... but this is not one of them.
-truth is subjected to the prism of which we view it-