[ Truth be known, a little gun regulation does help us all. A lot harms us all. None harms us all. There are many ways to be the strongest. You can be a huge hulking physical mass, a trained person in some kind of martial arts, a Boxer, or have a gun. Take your pick. Within 20 feet, if you don't have your gun already ready, you may have just brought your gun to a knife fight which may mean the shiv specialtist may be the strongest. Baseball Bats at 5 feet also work. Or you may have a sharp wit and confuse the hell out of the other person and get them to hesitate pulling their weapon while you pull your less effective weapon out (hit him with a toaster).
Now about resisting the Governments Tyranny, let's look at that. When the nation was formed, you are right. The Civilians were armed exactly like the maximum number of the Federal Military (75,000) was. Almost any State could raise an army that large very quickly and it was called a State Militia comprised of ALL Free White Men from the ages of 17 to 45. There was no way that the Feds could go up against even ONE state much less all of them. It was the Feds that called on the States for many of the things that the Feds would do today like the Whiskey Rebellion.
It worked out well until the Civil War where the State Militias had to be called up to fight a major war. It started to break down from there when more and more really nasty and expensive weapons were being introduced. Up until then, a Canon could be had by almost any rich person who would proudly display it at fairs and fire it. But right around the corner was the Artillery, Machine Guns, Mortars, and even nastier stuff that was very, very expensive and required a high degree of special training to use. Hello WWI.
In 1917, it was found that the old States Guards method would no longer work. They needed to call up millions for the war effort and under the Militia Laws, they could not call up the State Guards. So they Nationalized the State Guards and the National Guard was formed. It was actually slowly forming before that but the 1917 National Guard Act just made it Formal. Now, the states could have their States Militias under the old rules but their Guard Units could be nationalized by the President of the United States in the case of an emergency. And I believe WWI qualified as an Emergency. The States could have stopped this easily but didn't because they could not afford the cost of training and equipping the Guards to the degree required for WWI. Only the Feds under a War Powers Act had that much money. At that point, the States could no longer go up against the Federal Government with even an inkling of a chance of success no matter what.
You say that the Guards would side with the States? Sure, if the Feds use the Guards inside your State to quell the state. But they won't. It's an old trick as old as kingdoms. Ship the local boys over to another region and ship the boys from that region to the troubled region and have them quell the riots. If it's a northern problem area, use southern boys. If it's a southern area, use northern boys. Kings, Dukes and the like did that all the time even borrowing from other Kingdoms with promises of favor.
AT the same time that the 1917 National Guard Act was put into law, the UCMJ (Uniform Code of Justice) had an addition to it that precluded any military member from not following the Constitution of the United States and had them refuse Illegal Orders. In 1878, the Posse Comitatus Act was past which made it difficult to use Federal Military Troops inside the US. It only applied to the Army, not the Navy or the Marines. The Air Force was added in 1956. The Navy (hence the Marines) has language in their regulations that pretty much say the same thing. The various Regs and UCMJ pretty much means that the Military will refuse any order given by any President that they feel is Illegal. Illegal means Unconstitutional. While they may not do an overthrow, they will probably do nothing. Just sit there. When that happens, any President in that situation is pretty well done. It's happened once in my lifetime and the President didn't give any unlawful or unconstitutional orders. But he was not coherent for at least 3 days. The Military quietly did a sit down.
You keep trying to scare the 7 year olds with this drivel. I took an oath 5 times. No one told me that I should disregard that oath or I was relieved from it. I still believe it's my duty to defend against all Enemies of the Nation both Foreign and Domestic. And, you sir, are Domestic. But then again, this is the internet, you also might be Foreign. But that crap is still part of the enemy of the State and Constitution.