I don't know if it has been mentioned on this thread (which I did not read all of). However, the 2nd ammendment says "well regulated militia" which hardly applies to the majority of gun owners. Furthermore, the times were vastly different then then they are now.

If we feel we must change our government, then we can vote for a new one. It is much more civilized and less messy than shooting our way there. Sadly, less than half of our citizens choose to participate. How many of those non-voters own guns with which they would be willing to fight to overthrow the government?