Pretty much anyone can get a gun, right? Because of the Constitution, right? Where's the magic thinking?
You say most people would support a tyrant, which may not be true but let's go with that. Given that, why wouldn't you want the opposition to that tyrrany to have guns? Your take seems defeatist. You want to just try to live peacefully as tyranny spreads?
One doesn't need a Constitutional right to keep and bear arms in order to keep and bear arms, only to do so legally. Expecting a tyrannical US regime to respect the 2nd Amendment in order to legitimize the means of its own demise seems shortsighted, and other countries manage to have revolutions and coups without a legal firearms market.
You say most people would support a tyrant, which may not be true but let's go with that. Given that, why wouldn't you want the opposition to that tyrrany to have guns? Your take seems defeatist. You want to just try to live peacefully as tyranny spreads?