No modern military can stand against a couple guys with guns and cowboy hats!
Our military seemed to have a pretty damn hard time in the Middle East against some dudes with AK-47s. Yeah we won, but it sure wasn't easy. You would think with a world class army we could've just mowed them over in a few weeks. Instead we spent multiple years and billions of dollars on the war.
I think you'd be hard pressed to find a country who could take over the US even without our army. I can't say the same for most of Western Europe or Japan. Australia would be a bit tougher, but still significantly easier than the US.
Yes yes, I hear you. These are all things that probably won't happen in our lifetime. But will they happen ever for the rest of time? I suspect that someday there will be a benefit that comes from the average US citizen being armed. Maybe it won't be in the next 10 years, or 50 years, or even 100 years, but based on history I don't want to be the unarmed one when the music stops. Things generally do not go well for them.
Then on another point, when I'm 70 years old and my house gets broken into, what am I supposed to do? Obviously I'll try to run, but I probably won't be all that quick. If the robber is younger than 60 I'm at a major disadvantage, not to mention my wife at the time. As a relatively large, young man I am not all that worried about personal consequences to me of a gun free society, as an elderly husband I'm not sure I'll be that psyched about it.
Personally I think maybe we should just put constantly running cameras on everyone's chests all the time. This would surely prevent crime better than a gun ban, and as long as you're following the law you have nothing to worry about. Sure, there's the whole right to privacy, but think of the child molestation and domestic violence we could stop! We all know the writers of the constitution never would have put that in there if they'd known how much crime we could prevent in the modern era with the tools we have. As long as only the government is in control of the video it will all work out for the best. Think of the children!
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety."
The ability to defend oneself is essential to liberty. A firearm is the great equalizer. It's the only way my Grandma will ever have a chance against anyone under the age of 80.