Let's stay focused. The reason is, many other people are reading these gun-related threads, and many of them probably do not even log in, or are just visiting once.
Many of those people could also be liberals, who are looking to see whether or not these gun owners are as nutty as the TV tells them.
Sometimes, posts can veer off into all kinds of directions, whether intentional or not, providing ammo for propagandists.
Anyway, back to the topic:
Eatingeyefish said: "Japan did do a ground invasion of the USA, thus the logic behind the alleged quote obviously did not serve as a deterrent."
We can only theorize what the logic is, but it is not unreasonable to think that a sustained invasion campaign would be close to impossible, even if you started a beach-head, because the contiguous and connected states have a large population of armed citizens dwarfing any landed enemy force.
Now, no military commander is going to land his troops just to have some bullet fun at the beach. It must be the start of a sustainable invasion campaign.
When the entire native population is armed, it is very unlikely said beach-head could even hold, much less support subsequent plans.
So while this topic was to ascertain whether or not the quote is authentic, there is nonetheless good reasoning behind it.
Certainly, an armed population of citizens is significantly harder to conquer than a disarmed population.
There should be no doubt about that point.