It isn't (really) about the guns, ammo, etc. What it really is about is fascists looking for control. Impeding our ability to stand up to them and fight back is just a bonus.
In the 20th century it cost several tens of millions of lives to learn that fascism and communism don't work - they only spread misery and death. Seems the human race forgets the lesson of liberty every generation or two and has to re-learn it the hard way. Looks like we're headed that way again.