This is why we have the second amendment. And the constitution as the thing to which office-holders swear allegiance to rather than to "the party" or "the president".
The 2nd amendment was actually put in by pressure from slave owners, who needed weapons in order to police slaves. After slavery was abolished, people kept the order of slavery by using tools (guns).
The common "idea" that the 2nd amendment was created for "freedom" can be traced back to a guest post in NRA newspaper written by a teenager which was then promoted heavily by the NRA.
source: https://news.streetroots.org/2019/05/31/thom-hartmann-why-we...
I didn't grow up in the US, but being exposed to US political discourse, I always took for granted this right wing talking point (though I thought it was ridiculous from the outset). Thank you for providing clarity and a decent looking source on something that, as you point out, makes no sense once you think a little longer about it.
That supposes that the Founders would forever rule and be unified, with no possibility of anyone else ever ruling. That obviously is idiotic.